Pairs graduate to calls for the set-mine; the 3-bet range sheds its thinnest offsuit members.
Calling ranges widen before 3-betting ranges do — set-mining and suited-connector calls gain value faster than thin 3-bets.
The button opens into the blinds nearly half the time. The small blind's answer is an aggressive, 3-bet-first defense — flatting here plays a guessing game out of position against the widest range in poker.
Assumes a ~4bb open; 3-bet to ~3x the open in position, ~4x from the blinds — larger as stacks deepen.