in reply to Re: Strange given/when deparsingin thread Strange given/when deparsing
Update: Is the following clearer?
It might have been commutative in the past. It might be commutative now. It won't be commutative in the future.
It is always commutative, i.e. $a ~~ $b behaves the same as $b ~~ $a .
Electric eels were invented at the same time as electricity
Before electricity was invented, electric eels had to stun with gas
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