c-cor ccccc co-co cocc- cocco cocom cocto comco commo commr comot corm- cormo coro- corot corto cott- cotto croco cromo croom croot crott mccoo mmccc mmmcc mmmmm mocco momot mooro mooto mormo moroc moror morro moto- motoc motor motto mrmom mrorr mt-tc mt-tm mt-tr mt-tt mtoto octo- octor omoro omoto ooooo ormoc oroco oromo ortoo otomo ototo ottom r-co- ro-ro rocco rocor roto- rotor rotot rotto tocco toco- tommo tomo- tomom tomor torro torto toto- totoo troco tromm trott ttttt