FLINT
If 1, then ?L??S, as changing A to L (from FAINT) gave +1
If 0, then ??A?S, as PLANS = 2 Reasoning -
????S is proven (the first point),____________________________________PLANS
PANES = 1 so not P???S (changing L to P from LANES did nothing), _______PLANS
FAINT = 0 so not ???NS,__________________________________________PLANS
FLINT = 0 so not ?L??S.__________________________________________PLANS
Thus the second point must have come from the A.