Constructions for C4[ 216, 77 ] = SDD(DW(18,3))
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XI(Rmap(108, 39) { 6, 36| 6}_ 36) = XI(Rmap(108, 40) { 6, 36| 2}_ 36) =
XI(Rmap(108, 56) { 18, 12| 2}_ 36)
= XI(Rmap(108, 57) { 18, 12| 6}_ 36) = SDD(DW( 18, 3)) = BGCG(DW( 18, 3);
K2;3)
= BGCG(DW( 36, 3); K1;3) = BGCG({4, 4}_[ 9, 6]; K1;2) = BGCG({4, 4}_< 12,
6>; K1;1)