Use the "total" stat modifier. This is the modifier for the stat score, plus species/racial modifier, plus any other modifiers.
Example 1: If modifier for stat score is +5, species/racial modifier is +3, and an other modifier is +2, then the "total" stat modifier is a +10.
Example 2: If modifier for stat score is +2, species/racial modifier is -1, and an other modifier is -2, then the "total" stat modifier is a -1.
Et cetera.
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