title: diff showing difference when there is none
body: <p>These two files show as different when compared with </p>
  
  <pre><code>diff d_out.txt D_out.txt
  </code></pre>
  
  <p>I'm using Ubuntu (12.10) terminal.</p>
  
  <p>The content of d_out.txt</p>
  
  <pre><code>ABCADBACDABCADBACDAB
  ABCABCABCABCABCABCAB
  CRASH
  CRASH
  CRASH
  ABCDCABADCDBABCDCABA
  ABCDBACBDABCDBACBDAB
  ABCCABBCAABCCABBCAAB
  ABCDDCBAABCDDCBAABCD
  CRASH
  CRASH
  ABCDEEDABCCBEDAADCBE
  ABCCAABCCAABCCAABCCA
  ABBCCABBCCABBCCABBCC
  ABCDEFFABCDEEFABCDDE
  AABCDEFFABCDEEFABCDD
  ABBCDEFAABCDEFFABCDE
  ABBCCDDEDDCCBBABBCCD
  CRASH
  CRASH
  ABCDEFGBADCFEBGDAFCB
  ABCDEBADCBEDABCDEBAD
  ABCDBADCABCDBADCABCD
  ABCDEFGHIABCDEFGHIAB
  ABCDEFGHIJABCDEFGHIJ
  ABCDEFGHIJKABCDEFGHI
  ABCDEFGHIJKLMNOPQRSA
  CRASH
  AABBCCDCCBBAAEAABBCC
  AABBCCDCCBBAAEAABBCC</code></pre>
  
  <p>The contents of D_out.txt</p>
  
  <pre><code>ABCADBACDABCADBACDAB
  ABCABCABCABCABCABCAB
  CRASH
  CRASH
  CRASH
  ABCDCABADCDBABCDCABA
  ABCDBACBDABCDBACBDAB
  ABCCABBCAABCCABBCAAB
  ABCDDCBAABCDDCBAABCD
  CRASH
  CRASH
  ABCDEEDABCCBEDAADCBE
  ABCCAABCCAABCCAABCCA
  ABBCCABBCCABBCCABBCC
  ABCDEFFABCDEEFABCDDE
  AABCDEFFABCDEEFABCDD
  ABBCDEFAABCDEFFABCDE
  ABBCCDDEDDCCBBABBCCD
  CRASH
  CRASH
  ABCDEFGBADCFEBGDAFCB
  ABCDEBADCBEDABCDEBAD
  ABCDBADCABCDBADCABCD
  ABCDEFGHIABCDEFGHIAB
  ABCDEFGHIJABCDEFGHIJ
  ABCDEFGHIJKABCDEFGHI
  ABCDEFGHIJKLMNOPQRSA
  CRASH
  AABBCCDCCBBAAEAABBCC
  AABBCCDCCBBAAEAABBCC</code></pre>
  
  <p>The text is originally from a program that was done to solve a contest problem. The D_out.txt file is the original judge output and d_out.txt is my output from the program that I've coded to solve that problem. I tried to find small differences but got none.</p>