These are the Boolean operations, ordered by ascending priority:
| Operation | Result | Notes | 
|---|---|---|
x or y | 
        if x is false, then y, else x | (1) | 
x and y | 
        if x is false, then x, else y | (1) | 
not x | 
        if x is false, then 1, else 0 | 
        (2) | 
Notes:
not a == b is interpreted as not (a ==
b), and a == not b is a syntax error.
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