True when rational is of the form 1/2**n, otherwise False.
1 True 1/2 True 1/3 False 1/4 True 1/5 False 1/6 False 1/7 False 1/8 True 1/9 False 1/10 False 1/11 False 1/12 False
durtools.is_assignable
durtools.is_pair
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