As someone who was perplexed, I've only heard perplex used in past tense (I was perplexed) so seeing "For the perplex" just made me confused as to what "perplex" meant and I had to do a further search to decipher this tree of comments haha

Ha, ha, sorry. English is not my native language.

A good way to remember it is to use a backronym:

e.g. - example given

i.e. - in effect

i.e. - in eother (words)

in explanation