eff               866 src/diffviewer/ydiff.c     diff_place_t eff;
eff               875 src/diffviewer/ydiff.c     eff = ord;
eff               884 src/diffviewer/ydiff.c #define F1 a[eff][0]
eff               885 src/diffviewer/ydiff.c #define F2 a[eff][1]