Indexed for both direct and reverse lookup.
okusumulula, okutuggulula, okufunduukulula, okubagulula; come untied, okusumulukuka, okusumuttuka, okutuggulukuka.
untie, okusumulula, okutuggulula, okufunduukulula, okubagulula; come untied, okusumulukuka, okusumuttuka, okutuggulukuka.