In the following function, the line row = row + 1 does not appear to be
correct
isArrow?(arr : List(List(Boolean)), a : NNI, b : NNI) : Boolean ==
row : NNI := 1
for x in arr repeat
if row = a then
val : Boolean := qelt(x, b)
return val
row = row + 1
false
Looking at the code, it would appear that this line should be
row := row + 1
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