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maybe

Run Example
(%i1)list:[1, 2, false, 3, 4];
(%o1)                         [1, 2, false, 3, 4]
(%i2) maybe(equal(false, 0));
(%o2)                               unknown
(%i3) 
Run Example
list:[1, 2, false, 3, 4];
(%o1)                         [1, 2, false, 3, 4]
(%i2) maybe(equal(false, null));
(%o2)                               unknown
(%i3) 
Run Example
list:[1, 2, false, 3, 4];
(%o1)                         [1, 2, false, 3, 4]
(%i2) is(maybe(equal(false, 0)));
(%o2)                               unknown
(%i3) 

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