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| {s1,s2,...,sn} | use | |
| {{c}} | use c in all cases | |
| {{c1,c2}} | alternate between | |
| {{c1,c2,...}} | cycle through all | |
| {s,{c}} | use s, then repeatedly use c | |
| {s1,{c},sn} | use | |
{s1,s2,...,{c1, c2, ... }, sm, ... , sn} | use the first sequence of | |
| {s1,s2,...,{},sm,...,sn} | use the first sequence of | |
| {i1->v1,i2->v2,...} | specify what to use at positions | |
| {spec,rules} | use rules to override specifications in spec |