1121 #	define	REP(f, t)	((f)*8 + (t))  in repeat()  macro
1130 	switch (REP(MAP(from), MAP(to))) {  in repeat()
1131 	case REP(0, 0):			/* must be user doing this */  in repeat()
1134 	case REP(0, 1):			/* as x{1,1}? */  in repeat()
1135 	case REP(0, N):			/* as x{1,n}? */  in repeat()
1136 	case REP(0, INF):		/* as x{1,}? */  in repeat()
1146 	case REP(1, 1):			/* trivial case */  in repeat()
1149 	case REP(1, N):			/* as x?x{1,n-1} */  in repeat()
1161 	case REP(1, INF):		/* as x+ */  in repeat()
1165 	case REP(N, N):			/* as xx{m-1,n-1} */  in repeat()
1169 	case REP(N, INF):		/* as xx{n-1,INF} */  in repeat()