sentences: a molecule is made of atoms chemically combined / bonded
docs: covalent_bond is chemical_bond. methanol_molecule is molecule. mating_factor_molecule is mating_factor_molecule. atom is molecular_component. mating_factor is molecular_material. covalent_linking is chemical_bonding. chemical_bonding is connecting. mating_factor_molecule is molecule. double_helixed_molecular_structure is molecule.