I sounds as though you are trying to use Nelson rules - Wikipedia number 3.

Paste this script into Script Console and play around with it. It looks like you could do the job in two lines.

```
arr1 = [1, 2, 3, 4, 5, 6]
arr2 = [1, 2, 4, 3, 5, 6]
arr3 = [1, 2, 3, 3, 5, 6]
print "Is the series strictly increasing?"
print all(x < y for x, y in zip(arr1, arr1[1:]))
print all(x < y for x, y in zip(arr2, arr2[1:]))
print all(x < y for x, y in zip(arr3, arr3[1:]))
print "Is the series strictly decreasing?"
print all(x > y for x, y in zip(arr1, arr1[1:]))
print all(x > y for x, y in zip(arr2, arr2[1:]))
print all(x > y for x, y in zip(arr3, arr3[1:]))
print "Is the series strictly non-increasing?"
print all(x >= y for x, y in zip(arr1, arr1[1:]))
print all(x >= y for x, y in zip(arr2, arr2[1:]))
print all(x >= y for x, y in zip(arr3, arr3[1:]))
print "Is the series strictly non-decreasing?"
print all(x <= y for x, y in zip(arr1, arr1[1:]))
print all(x <= y for x, y in zip(arr2, arr2[1:]))
print all(x <= y for x, y in zip(arr3, arr3[1:]))
```

For more on this see Python - How to check list monotonicity - Stack Overflow.

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