Same function, different behaviors. How do you get that?

Sorting in ARPACK.

```
c WHICH Character*2. (Input)
c 'LM' -> X1 is sorted into increasing order of magnitude.
c 'SM' -> X1 is sorted into decreasing order of magnitude.
c 'LA' -> X1 is sorted into increasing order of algebraic.
c 'SA' -> X1 is sorted into decreasing order of algebraic.
```

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