Post making contest 3.0

to be fair, it was a sort of cheap way to get them to combine a 145 compliant rule with the thing that makes rule 2 work

I don't believe anything has passed rule 3 (and rule 5) so I guess that should be the next thing to do.

Come on, this was designed to be cheesable. Why else would a three character post be able to pass all five? Also, passes rules 4 and 5.

Reuse

Reduce

Recycle

Passes rule 5.

Kíero
Kíer s
Kie os
Ki ros
K eros
íeros

Passes rules 2, 4, and 5. E: And 1

Just to help, the thing which gets something to fail rule 5 is the same thing which gets it to pass rule 3 (and 1, but you've already got that). So just changing up my username is about as helpful as posting the entire alphabet one letter at a time.
And for the record, any letter of the alphabet by itself just passes rule 5.