. . . . . . "Specifies whether a conversion occurs spontaneously or not. If the spontaneity is not known, the SPONTANEOUS property should be left empty."^^ . "Specifies whether a conversion occurs spontaneously or not. If the spontaneity is not known, the SPONTANEOUS property should be left empty."^^ . "Specifies whether a conversion occurs spontaneously or not. If the spontaneity is not known, the SPONTANEOUS property should be left empty."^^ . . . . . . .