cccc ccgc ccgt ccoc cctc cctt cgcc cgcg chch choc choh choo chto chtt coch coco coct cogh cogo coho cooh coot cotc coth coto cott ctot gc-c gccc gctc gggg gghg goch gogh gogo goog goot goth goto gott gtco hccc hcch hcgh hggc hgtc hhgg hhhh hoch hogg hogh hogo hoho hoot hoth hoto hott htcc htoh occc occt ocht oct- octo oght ogog ohcc ohho ohoh ohto ooho oooh oooo otho oto- otog otoh otoo otto tccc tch- tchh tcho tctc tgcc tgtc thch thog thoo thot toch toco togh togo togt toho tooh toot totc toth toto tott tttt