KASH3 Ref - Sub

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| ### Function Sub ( any R, nof(any) a ) -> any S, map() m ### Optional Arguments
Results | elt-ord^rat |  | if Results:=2 also the map is returned
### Description The substructure 'S' of 'R' specified by 'a' and the embedding 'm' of 'S' into 'R' if requested. ### Examples a := FreeAbelianGroup(2); s := Sub(a,2*a.1,7*a.2); b := Sub(Z,17,rec(Results:=2));
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