Are repeated values (e.g. `[1, 1, 2]`

) monotonic?

If **yes**:

```
def non_decreasing(L):
return all(x<=y for x, y in zip(L, L[1:]))
def non_increasing(L):
return all(x>=y for x, y in zip(L, L[1:]))
def monotonic(L):
return non_decreasing(L) or non_increasing(L)
```

If **no**:

```
def strictly_increasing(L):
return all(x<y for x, y in zip(L, L[1:]))
def strictly_decreasing(L):
return all(x>y for x, y in zip(L, L[1:]))
def strictly_monotonic(L):
return strictly_increasing(L) or strictly_decreasing(L)
```