crop.txt


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    .
    |\
    | \
    |  \       OUT
  ~~|~~~\~~~~~~~~~
    |    \      IN
    |     \
    |   _-`
    |_-`
    `

   p1
   q1
    .
    |\                  r3, q2, q3
    | \                 r3, r2, q2
  r2|  \r3     OUT
  ~~|~~~\~~~~~~~~~
    |    \      IN
    |     \ p3
    |   _-` q3
    |_-`
 p2 `
 q2

   p2
   q1
    .
    |\                  r2, q3, q2
    | \                 r2, r3, q3
  r3|  \r2     OUT
  ~~|~~~\~~~~~~~~~
    |    \      IN
    |     \ p1
    |   _-` q2
    |_-`
 p3 `
 q3

   p3
   q1
    .
    |\                  r2, q3, q2
    | \                 r2, r3, q3
  r3|  \r2     OUT
  ~~|~~~\~~~~~~~~~
    |    \      IN
    |     \ p2
    |   _-` q2
    |_-`
 p1 `
 q3

   p1
   q1
    .
    |\                  q1, r2, r3
    | \
  r2|  \r3      IN
  ~~|~~~\~~~~~~~~~
    |    \     OUT
    |     \ p3
    |   _-` q3
    |_-`
 p2 `
 q2

   p2
   q1
    .
    |\                  q1, r3, r2
    | \
  r3|  \r2      IN
  ~~|~~~\~~~~~~~~~
    |    \     OUT
    |     \ p1
    |   _-` q2
    |_-`
 p3 `
 q3

   p3
   q1
    .
    |\                  q1, r3, r2
    | \
  r3|  \r2      IN
  ~~|~~~\~~~~~~~~~
    |    \     OUT
    |     \ p2
    |   _-` q2
    |_-`
 p1 `
 q3