eff               902 src/diffviewer/ydiff.c     diff_place_t eff;
eff               911 src/diffviewer/ydiff.c     eff = ord;
eff               923 src/diffviewer/ydiff.c #define F1 a[eff][0]
eff               924 src/diffviewer/ydiff.c #define F2 a[eff][1]