eff               892 src/diffviewer/ydiff.c     diff_place_t eff;
eff               901 src/diffviewer/ydiff.c     eff = ord;
eff               913 src/diffviewer/ydiff.c #define F1 a[eff][0]
eff               914 src/diffviewer/ydiff.c #define F2 a[eff][1]