eff               900 src/diffviewer/ydiff.c     diff_place_t eff;
eff               909 src/diffviewer/ydiff.c     eff = ord;
eff               921 src/diffviewer/ydiff.c #define F1 a[eff][0]
eff               922 src/diffviewer/ydiff.c #define F2 a[eff][1]