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Creates a square confusion matrix with equal stimulus labels and response labels.
The command Create simple Confusion: "simple", "u i a" results in the following Confusion:
        u    i    a   ! The response labels
   u    0    0    0   ! Responses on stimulus  u,
   i    0    0    0   ! Responses on stimulus  i
   a    0    0    0   ! Responses on stimulus  a
© djmw 20140117