194 #define	F(l, r, key) {\  macro
256 	F(left, right, ks);  in des()
257 	F(right, left, ks + 2);  in des()
258 	F(left, right, ks + 4);  in des()
259 	F(right, left, ks + 6);  in des()
260 	F(left, right, ks + 8);  in des()
261 	F(right, left, ks + 10);  in des()
262 	F(left, right, ks + 12);  in des()
263 	F(right, left, ks + 14);  in des()
264 	F(left, right, ks + 16);  in des()
265 	F(right, left, ks + 18);  in des()
266 	F(left, right, ks + 20);  in des()
267 	F(right, left, ks + 22);  in des()
268 	F(left, right, ks + 24);  in des()
269 	F(right, left, ks + 26);  in des()
270 	F(left, right, ks + 28);  in des()
271 	F(right, left, ks + 30);  in des()