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Sorry for the noise, I'm seeing the light -- I should have written

```

def ff(b): return(max([b, 1-b]))

show(plot(ff, (a, 0, 1)))

```

The other writing mixes symbolic rules with pure code. Best, O.

Sorry for the noise, I'm seeing the light -- I should have written

def ff(b):
    return(max([b, 1-b]))
1-b]))
  
show(plot(ff, (a, 0, 1)))
 
```1)))