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    39. 

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    42. 

  42.         <a href="echonest-module.html">Package&nbsp;echonest</a> ::
    43. 

  43.         <a href="echonest.support-module.html">Package&nbsp;support</a> ::
    44. 

  44.         <a href="echonest.support.midi-module.html">Package&nbsp;midi</a> ::
    45. 

  45.         Module&nbsp;DataTypeConverters
    46. 

  46.       </span>
    47. 

  47.     </td>
    48. 

  48.     <td>
    49. 

  49.       <table cellpadding="0" cellspacing="0">
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    52. 

  52.     onclick="toggle_private();">hide&nbsp;private</a>]</span></td></tr>
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  54.             >[<a href="frames.html" target="_top">frames</a
    55. 

  55.             >]&nbsp;|&nbsp;<a href="echonest.support.midi.DataTypeConverters-module.html"
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  56.             target="_top">no&nbsp;frames</a>]</span></td></tr>
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    61. 

  61. <!-- ==================== MODULE DESCRIPTION ==================== -->
    62. 

  62. <h1 class="epydoc">Module DataTypeConverters</h1><p class="nomargin-top"><span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html">source&nbsp;code</a></span></p>
    63. 

  63. <!-- ==================== FUNCTIONS ==================== -->
    64. 

  64. <a name="section-Functions"></a>
    65. 

  65. <table class="summary" border="1" cellpadding="3"
    66. 

  66.        cellspacing="0" width="100%" bgcolor="white">
    67. 

  67. <tr bgcolor="#70b0f0" class="table-header">
    68. 

  68.   <td colspan="2" class="table-header">
    69. 

  69.     <table border="0" cellpadding="0" cellspacing="0" width="100%">
    70. 

  70.       <tr valign="top">
    71. 

  71.         <td align="left"><span class="table-header">Functions</span></td>
    72. 

  72.         <td align="right" valign="top"
    73. 

  73.          ><span class="options">[<a href="#section-Functions"
    74. 

  74.          class="privatelink" onclick="toggle_private();"
    75. 

  75.          >hide private</a>]</span></td>
    76. 

  76.       </tr>
    77. 

  77.     </table>
    78. 

  78.   </td>
    79. 

  79. </tr>
    80. 

  80. <tr>
    81. 

  81.     <td width="15%" align="right" valign="top" class="summary">
    82. 

  82.       <span class="summary-type">&nbsp;</span>
    83. 

  83.     </td><td class="summary">
    84. 

  84.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    85. 

  85.         <tr>
    86. 

  86.           <td><span class="summary-sig"><a href="echonest.support.midi.DataTypeConverters-module.html#getNibbles" class="summary-sig-name">getNibbles</a>(<span class="summary-sig-arg">byte</span>)</span><br />
    87. 

  87.       Returns hi and lo bits in a byte as a tuple
    88. 

  88. &gt;&gt;&gt; getNibbles(142)
    89. 

  89. (8, 14)</td>
    90. 

  90.           <td align="right" valign="top">
    91. 

  91.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#getNibbles">source&nbsp;code</a></span>
    92. 

  92.             
    93. 

  93.           </td>
    94. 

  94.         </tr>
    95. 

  95.       </table>
    96. 

  96.       
    97. 

  97.     </td>
    98. 

  98.   </tr>
    99. 

  99. <tr>
    100. 

  100.     <td width="15%" align="right" valign="top" class="summary">
    101. 

  101.       <span class="summary-type">&nbsp;</span>
    102. 

  102.     </td><td class="summary">
    103. 

  103.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    104. 

  104.         <tr>
    105. 

  105.           <td><span class="summary-sig"><a name="setNibbles"></a><span class="summary-sig-name">setNibbles</span>(<span class="summary-sig-arg">hiNibble</span>,
    106. 

  106.         <span class="summary-sig-arg">loNibble</span>)</span><br />
    107. 

  107.       Returns byte with value set according to hi and lo bits
    108. 

  108. Asserts hiNibble and loNibble in range(16)
    109. 

  109. &gt;&gt;&gt; setNibbles(8, 14)
    110. 

  110. 142</td>
    111. 

  111.           <td align="right" valign="top">
    112. 

  112.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#setNibbles">source&nbsp;code</a></span>
    113. 

  113.             
    114. 

  114.           </td>
    115. 

  115.         </tr>
    116. 

  116.       </table>
    117. 

  117.       
    118. 

  118.     </td>
    119. 

  119.   </tr>
    120. 

  120. <tr>
    121. 

  121.     <td width="15%" align="right" valign="top" class="summary">
    122. 

  122.       <span class="summary-type">&nbsp;</span>
    123. 

  123.     </td><td class="summary">
    124. 

  124.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    125. 

  125.         <tr>
    126. 

  126.           <td><span class="summary-sig"><a name="readBew"></a><span class="summary-sig-name">readBew</span>(<span class="summary-sig-arg">value</span>)</span><br />
    127. 

  127.       Reads string as big endian word, (asserts len(value) in [1,2,4])
    128. 

  128. &gt;&gt;&gt; readBew('a&#225;&#226;&#227;')
    129. 

  129. 1642193635L
    130. 

  130. &gt;&gt;&gt; readBew('a&#225;')
    131. 

  131. 25057</td>
    132. 

  132.           <td align="right" valign="top">
    133. 

  133.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#readBew">source&nbsp;code</a></span>
    134. 

  134.             
    135. 

  135.           </td>
    136. 

  136.         </tr>
    137. 

  137.       </table>
    138. 

  138.       
    139. 

  139.     </td>
    140. 

  140.   </tr>
    141. 

  141. <tr>
    142. 

  142.     <td width="15%" align="right" valign="top" class="summary">
    143. 

  143.       <span class="summary-type">&nbsp;</span>
    144. 

  144.     </td><td class="summary">
    145. 

  145.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    146. 

  146.         <tr>
    147. 

  147.           <td><span class="summary-sig"><a href="echonest.support.midi.DataTypeConverters-module.html#writeBew" class="summary-sig-name">writeBew</a>(<span class="summary-sig-arg">value</span>,
    148. 

  148.         <span class="summary-sig-arg">length</span>)</span><br />
    149. 

  149.       Write int as big endian formatted string, (asserts length in [1,2,4])
    150. 

  150. Difficult to print the result in doctest, so I do a simple roundabout test.</td>
    151. 

  151.           <td align="right" valign="top">
    152. 

  152.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#writeBew">source&nbsp;code</a></span>
    153. 

  153.             
    154. 

  154.           </td>
    155. 

  155.         </tr>
    156. 

  156.       </table>
    157. 

  157.       
    158. 

  158.     </td>
    159. 

  159.   </tr>
    160. 

  160. <tr>
    161. 

  161.     <td width="15%" align="right" valign="top" class="summary">
    162. 

  162.       <span class="summary-type">&nbsp;</span>
    163. 

  163.     </td><td class="summary">
    164. 

  164.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    165. 

  165.         <tr>
    166. 

  166.           <td><span class="summary-sig"><a href="echonest.support.midi.DataTypeConverters-module.html#readVar" class="summary-sig-name">readVar</a>(<span class="summary-sig-arg">value</span>)</span><br />
    167. 

  167.       Converts varlength format to integer.</td>
    168. 

  168.           <td align="right" valign="top">
    169. 

  169.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#readVar">source&nbsp;code</a></span>
    170. 

  170.             
    171. 

  171.           </td>
    172. 

  172.         </tr>
    173. 

  173.       </table>
    174. 

  174.       
    175. 

  175.     </td>
    176. 

  176.   </tr>
    177. 

  177. <tr>
    178. 

  178.     <td width="15%" align="right" valign="top" class="summary">
    179. 

  179.       <span class="summary-type">&nbsp;</span>
    180. 

  180.     </td><td class="summary">
    181. 

  181.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    182. 

  182.         <tr>
    183. 

  183.           <td><span class="summary-sig"><a name="varLen"></a><span class="summary-sig-name">varLen</span>(<span class="summary-sig-arg">value</span>)</span><br />
    184. 

  184.       Returns the the number of bytes an integer will be when
    185. 

  185. converted to varlength</td>
    186. 

  186.           <td align="right" valign="top">
    187. 

  187.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#varLen">source&nbsp;code</a></span>
    188. 

  188.             
    189. 

  189.           </td>
    190. 

  190.         </tr>
    191. 

  191.       </table>
    192. 

  192.       
    193. 

  193.     </td>
    194. 

  194.   </tr>
    195. 

  195. <tr>
    196. 

  196.     <td width="15%" align="right" valign="top" class="summary">
    197. 

  197.       <span class="summary-type">&nbsp;</span>
    198. 

  198.     </td><td class="summary">
    199. 

  199.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    200. 

  200.         <tr>
    201. 

  201.           <td><span class="summary-sig"><a name="writeVar"></a><span class="summary-sig-name">writeVar</span>(<span class="summary-sig-arg">value</span>)</span><br />
    202. 

  202.       Converts an integer to varlength format</td>
    203. 

  203.           <td align="right" valign="top">
    204. 

  204.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#writeVar">source&nbsp;code</a></span>
    205. 

  205.             
    206. 

  206.           </td>
    207. 

  207.         </tr>
    208. 

  208.       </table>
    209. 

  209.       
    210. 

  210.     </td>
    211. 

  211.   </tr>
    212. 

  212. <tr>
    213. 

  213.     <td width="15%" align="right" valign="top" class="summary">
    214. 

  214.       <span class="summary-type">&nbsp;</span>
    215. 

  215.     </td><td class="summary">
    216. 

  216.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    217. 

  217.         <tr>
    218. 

  218.           <td><span class="summary-sig"><a name="to_n_bits"></a><span class="summary-sig-name">to_n_bits</span>(<span class="summary-sig-arg">value</span>,
    219. 

  219.         <span class="summary-sig-arg">length</span>=<span class="summary-sig-default">1</span>,
    220. 

  220.         <span class="summary-sig-arg">nbits</span>=<span class="summary-sig-default">7</span>)</span><br />
    221. 

  221.       returns the integer value as a sequence of nbits bytes</td>
    222. 

  222.           <td align="right" valign="top">
    223. 

  223.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#to_n_bits">source&nbsp;code</a></span>
    224. 

  224.             
    225. 

  225.           </td>
    226. 

  226.         </tr>
    227. 

  227.       </table>
    228. 

  228.       
    229. 

  229.     </td>
    230. 

  230.   </tr>
    231. 

  231. <tr>
    232. 

  232.     <td width="15%" align="right" valign="top" class="summary">
    233. 

  233.       <span class="summary-type">&nbsp;</span>
    234. 

  234.     </td><td class="summary">
    235. 

  235.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    236. 

  236.         <tr>
    237. 

  237.           <td><span class="summary-sig"><a name="toBytes"></a><span class="summary-sig-name">toBytes</span>(<span class="summary-sig-arg">value</span>)</span><br />
    238. 

  238.       Turns a string into a list of byte values</td>
    239. 

  239.           <td align="right" valign="top">
    240. 

  240.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#toBytes">source&nbsp;code</a></span>
    241. 

  241.             
    242. 

  242.           </td>
    243. 

  243.         </tr>
    244. 

  244.       </table>
    245. 

  245.       
    246. 

  246.     </td>
    247. 

  247.   </tr>
    248. 

  248. <tr>
    249. 

  249.     <td width="15%" align="right" valign="top" class="summary">
    250. 

  250.       <span class="summary-type">&nbsp;</span>
    251. 

  251.     </td><td class="summary">
    252. 

  252.       <table width="100%" cellpadding="0" cellspacing="0" border="0">
    253. 

  253.         <tr>
    254. 

  254.           <td><span class="summary-sig"><a name="fromBytes"></a><span class="summary-sig-name">fromBytes</span>(<span class="summary-sig-arg">value</span>)</span><br />
    255. 

  255.       Turns a list of bytes into a string</td>
    256. 

  256.           <td align="right" valign="top">
    257. 

  257.             <span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#fromBytes">source&nbsp;code</a></span>
    258. 

  258.             
    259. 

  259.           </td>
    260. 

  260.         </tr>
    261. 

  261.       </table>
    262. 

  262.       
    263. 

  263.     </td>
    264. 

  264.   </tr>
    265. 

  265. </table>
    266. 

  266. <!-- ==================== VARIABLES ==================== -->
    267. 

  267. <a name="section-Variables"></a>
    268. 

  268. <table class="summary" border="1" cellpadding="3"
    269. 

  269.        cellspacing="0" width="100%" bgcolor="white">
    270. 

  270. <tr bgcolor="#70b0f0" class="table-header">
    271. 

  271.   <td colspan="2" class="table-header">
    272. 

  272.     <table border="0" cellpadding="0" cellspacing="0" width="100%">
    273. 

  273.       <tr valign="top">
    274. 

  274.         <td align="left"><span class="table-header">Variables</span></td>
    275. 

  275.         <td align="right" valign="top"
    276. 

  276.          ><span class="options">[<a href="#section-Variables"
    277. 

  277.          class="privatelink" onclick="toggle_private();"
    278. 

  278.          >hide private</a>]</span></td>
    279. 

  279.       </tr>
    280. 

  280.     </table>
    281. 

  281.   </td>
    282. 

  282. </tr>
    283. 

  283. <tr>
    284. 

  284.     <td width="15%" align="right" valign="top" class="summary">
    285. 

  285.       <span class="summary-type">&nbsp;</span>
    286. 

  286.     </td><td class="summary">
    287. 

  287.         <a name="__package__"></a><span class="summary-name">__package__</span> = <code title="'echonest.support.midi'"><code class="variable-quote">'</code><code class="variable-string">echonest.support.midi</code><code class="variable-quote">'</code></code>
    288. 

  288.     </td>
    289. 

  289.   </tr>
    290. 

  290. </table>
    291. 

  291. <!-- ==================== FUNCTION DETAILS ==================== -->
    292. 

  292. <a name="section-FunctionDetails"></a>
    293. 

  293. <table class="details" border="1" cellpadding="3"
    294. 

  294.        cellspacing="0" width="100%" bgcolor="white">
    295. 

  295. <tr bgcolor="#70b0f0" class="table-header">
    296. 

  296.   <td colspan="2" class="table-header">
    297. 

  297.     <table border="0" cellpadding="0" cellspacing="0" width="100%">
    298. 

  298.       <tr valign="top">
    299. 

  299.         <td align="left"><span class="table-header">Function Details</span></td>
    300. 

  300.         <td align="right" valign="top"
    301. 

  301.          ><span class="options">[<a href="#section-FunctionDetails"
    302. 

  302.          class="privatelink" onclick="toggle_private();"
    303. 

  303.          >hide private</a>]</span></td>
    304. 

  304.       </tr>
    305. 

  305.     </table>
    306. 

  306.   </td>
    307. 

  307. </tr>
    308. 

  308. </table>
    309. 

  309. <a name="getNibbles"></a>
    310. 

  310. <div>
    311. 

  311. <table class="details" border="1" cellpadding="3"
    312. 

  312.        cellspacing="0" width="100%" bgcolor="white">
    313. 

  313. <tr><td>
    314. 

  314.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    315. 

  315.   <tr valign="top"><td>
    316. 

  316.   <h3 class="epydoc"><span class="sig"><span class="sig-name">getNibbles</span>(<span class="sig-arg">byte</span>)</span>
    317. 

  317.   </h3>
    318. 

  318.   </td><td align="right" valign="top"
    319. 

  319.     ><span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#getNibbles">source&nbsp;code</a></span>&nbsp;
    320. 

  320.     </td>
    321. 

  321.   </tr></table>
    322. 

  322.   
    323. 

  323.   <pre class="literalblock">
    324. 

  324. 

  325. Returns hi and lo bits in a byte as a tuple
    326. 

  326. &gt;&gt;&gt; getNibbles(142)
    327. 

  327. (8, 14)
    328. 

  328. 

  329. Asserts byte value in byte range
    330. 

  330. &gt;&gt;&gt; getNibbles(256)
    331. 

  331. Traceback (most recent call last):
    332. 

  332.     ...
    333. 

  333. ValueError: Byte value out of range 0-255: 256
    334. 

  334. 

  335. </pre>
    336. 

  336.   <dl class="fields">
    337. 

  337.   </dl>
    338. 

  338. </td></tr></table>
    339. 

  339. </div>
    340. 

  340. <a name="writeBew"></a>
    341. 

  341. <div>
    342. 

  342. <table class="details" border="1" cellpadding="3"
    343. 

  343.        cellspacing="0" width="100%" bgcolor="white">
    344. 

  344. <tr><td>
    345. 

  345.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    346. 

  346.   <tr valign="top"><td>
    347. 

  347.   <h3 class="epydoc"><span class="sig"><span class="sig-name">writeBew</span>(<span class="sig-arg">value</span>,
    348. 

  348.         <span class="sig-arg">length</span>)</span>
    349. 

  349.   </h3>
    350. 

  350.   </td><td align="right" valign="top"
    351. 

  351.     ><span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#writeBew">source&nbsp;code</a></span>&nbsp;
    352. 

  352.     </td>
    353. 

  353.   </tr></table>
    354. 

  354.   
    355. 

  355.   Write int as big endian formatted string, (asserts length in [1,2,4])
    356. 

  356. Difficult to print the result in doctest, so I do a simple roundabout test.
    357. 

  357. &gt;&gt;&gt; readBew(writeBew(25057, 2))
    358. 

  358. 25057
    359. 

  359. &gt;&gt;&gt; readBew(writeBew(1642193635L, 4))
    360. 

  360. 1642193635L
    361. 

  361.   <dl class="fields">
    362. 

  362.   </dl>
    363. 

  363. </td></tr></table>
    364. 

  364. </div>
    365. 

  365. <a name="readVar"></a>
    366. 

  366. <div>
    367. 

  367. <table class="details" border="1" cellpadding="3"
    368. 

  368.        cellspacing="0" width="100%" bgcolor="white">
    369. 

  369. <tr><td>
    370. 

  370.   <table width="100%" cellpadding="0" cellspacing="0" border="0">
    371. 

  371.   <tr valign="top"><td>
    372. 

  372.   <h3 class="epydoc"><span class="sig"><span class="sig-name">readVar</span>(<span class="sig-arg">value</span>)</span>
    373. 

  373.   </h3>
    374. 

  374.   </td><td align="right" valign="top"
    375. 

  375.     ><span class="codelink"><a href="echonest.support.midi.DataTypeConverters-pysrc.html#readVar">source&nbsp;code</a></span>&nbsp;
    376. 

  376.     </td>
    377. 

  377.   </tr></table>
    378. 

  378.   
    379. 

  379.   Converts varlength format to integer. Just pass it 0 or more chars that
    380. 

  380. might be a varlen and it will only use the relevant chars.
    381. 

  381. use varLen(readVar(value)) to see how many bytes the integer value takes.
    382. 

  382. asserts len(value) &gt;= 0
    383. 

  383. &gt;&gt;&gt; readVar('&#128;&#64;')
    384. 

  384. 64
    385. 

  385. &gt;&gt;&gt; readVar('&#225;&#226;&#227;a')
    386. 

  386. 205042145
    387. 

  387.   <dl class="fields">
    388. 

  388.   </dl>
    389. 

  389. </td></tr></table>
    390. 

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    391. 

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    392. 

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    393. 

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    394. 

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    396. 

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    398. 

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    399. 

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    400. 

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    402. 

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    403. 

  403.         href="identifier-index.html">Indices</a>&nbsp;&nbsp;&nbsp;</th>
    404. 

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    407. 

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    411. 

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    412. 

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    413. 

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    414. 

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    415. 

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    416. 

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    417. 

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    418. 

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    419. 

  419.     <td align="left" class="footer">
    420. 

  420.     Generated by Epydoc 3.0.1 on Wed Sep  1 16:08:57 2010
    421. 

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    422. 

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    423. 

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    424. 

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    425. 

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    426. 

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    427. 

  427. </table>
    428. 

  428. 

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    430. 

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    431. 

  431.   // Private objects are initially displayed (because if
    432. 

  432.   // javascript is turned off then we want them to be
    433. 

  433.   // visible); but by default, we want to hide them.  So hide
    434. 

  434.   // them unless we have a cookie that says to show them.
    435. 

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    436. 

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    438. 

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    440.