"0"^^ . . . . "a colorless flammable gas used chiefly in welding and in organic synthesis"@en-us . "14600742-n"^^ . . . "a colorless flammable gas used chiefly in welding and in organic synthesis"@en-us . "acetylene"@en-us . . . "ethyne"@en-us . . . "113764726"@en-us . "acetylene"^^ . . . "alkyne"@en-us . . . "0"^^ . "114600742"^^ . .