{3,1} bond_embed(B) :- b_4(B).
{3,1} bond_embed(B) :- b_3(B).
{3,1} bond_embed(B) :- b_doublebond(B).
{3,1} bond_embed(B) :- b_5(B).
{3,1} bond_embed(B) :- b_ar(B).
{3,1} bond_embed(B) :- b_triplebond(B).
{3,1} bond_embed(B) :- b_2(B).
{3,1} bond_embed(B) :- b_7(B).
{3,1} bond_embed(B) :- b_resonantbond(B).
{3,1} bond_embed(B) :- b_singlebond(B).
{3,1} bond_embed(B) :- b_1(B).
{3,1} bond_embed(B) :- b_am(B).
