The following conditional identities are applied:
c ? x : x -> x
false ? x : y -> y; true ? x : y -> x
c ? true : false -> c; c ? false : true -> !c
!c ? x : y -> c ? y : x
Lastly, for expression chains x, y in a conditional expression
c ? x : y,
we evaluate all conditionals in the expression chains with the
condition c, assuming c is true (for x), or false (for y).
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