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    <p>I'm still fiddling with this -- no answer yet, or even a clear direction, but some of this random assortment of facts might be useful to someone..</p> <p><strong>Meta: Is there any way to mark "read more" in an answer? Sorry in advance for all the scrolling this answer will cause!</strong></p> <p>The code is 708 digits long. Prime factorization: 2 2 3 59. Unless they're being tricky by padding the ends, the chunk size must be 1, 2, 4, 6, or 12; the higher factors are silly. This assumes, of course, that the code is based on concatenated chunks, which may not be the case.</p> <p>Mike Stone suggested a chunk size of 3. Here's the distribution for that:</p> <pre> Number of distinct chunks: 64 Number of chunks: 236 (length of message) 275: ### 279: ####### 282: #### 283: # 284: #### 285: ## 286: # 287: ### 288: # 289: ### 292: # 293: #### 297: # 323: ############################# 324: ####### 325: ####### 326: #### 327: #### 328: ## 329: ##### 332: ### 333: ########### 334: ### 335: ###### 336: ### 337: # 338: #### 339: ### 342: # 343: ## 344: ### 345: # 346: ### 347: ## 348: ### 349: ### 352: #### 353: # 354: ## 363: ## 364: ####### 365: ##### 366: ##### 367: ## 368: ### 369: ## 372: ### 373: ## 374: ## 375: ### 376: ####### 377: #### 378: ## 382: ### 383: ### 384: ### 385: #### 387: ## 388: ###### 389: ## 392: ### 393: #### 394: ### 449: # </pre> <p>If it's base64 encoded then we might have something ;) but my gut tells me that there are too many distinct chunks of length 3 for plain English text. There is indeed that odd blip for the symbol "323" though.</p> <p>Somewhat more interesting is a chunk size of 2:</p> <pre> Number of distinct chunks: 49 Number of chunks: 354 (length of message) 22: ## 23: ######################## 24: ##### 25: ###### 26: # 27: ###### 28: ######### 29: #### 32: ################################## 33: ################################################ 34: ########### 35: ######## 36: ############## 37: ############ 38: ################## 39: #### 42: ## 43: ########### 44: ### 45: # 46: # 47: # 49: ## 52: # 53: ######### 54: ## 62: # 63: ############# 64: #### 65: ### 66: ## 67: ## 68: # 72: ### 73: ############ 74: # 75: #### 76: ##### 77: # 79: #### 82: ###### 83: ########### 84: ##### 85: #### 88: #### 89: # 92: ######### 93: ################ 94: ## </pre> <p>As for letter frequency, that's a good strategy, but remember that the text is likely to contain spaces and punctuation. Space might be the most common character by far!</p> <p>Meta: This question re-asks a question found elsewhere. Does that count as homework? :)</p>
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