+ //reset child's filter counts to 0;
+ F.a.clear(); F.a.resize(alignmentLength, 0);
+ F.t.clear(); F.t.resize(alignmentLength, 0);
+ F.g.clear(); F.g.resize(alignmentLength, 0);
+ F.c.clear(); F.c.resize(alignmentLength, 0);
+ F.gap.clear(); F.gap.resize(alignmentLength, 0);
+