GeneralizedCodeNorm( code, subcode1, subcode2, ..., subcodek )
GeneralizedCodeNorm returns the k-norm of code with
respect to k subcodes.
gap> c := RepetitionCode( 7, GF(2) );;
gap> ham := HammingCode( 3, GF(2) );;
gap> d := EvenWeightSubcode( ham );;
gap> e := ConstantWeightSubcode( ham, 3 );;
gap> GeneralizedCodeNorm( ham, c, d, e );
4
GAP 3.4.4