Example:
Bidquest: Abiding by the 5cardMABBS South opens 1NT declaring 15-17 hcpts. North having four hearts and 13 pts. bids two clubs (Stayman Convention). South at North's behest bids two hearts. North estimating the combined hand count to be 29 pts. (five level pt. range) and knowing the trump footprint will be 4/4 not the 5/3 requisite trump footprint, bids four hearts knowing the combined hands have 26 pts. (four level range) after subtracting 3 pts. for the missing card from the requisite trump footprint. Had the point count been below 26 pts., North would have bid three hearts.
Stayman is the largest spawner of 4/4 trump footprints. I've noticed that when a 4/4 trump footprint's hcpts. is below six in one of the hands, the chance of being set becomes very high.