a-do aaaa aaac aaad aaca aacc aacd aaco aada aadc aaoo acaa acac acad acca accc accd acco acda acdc acoa acod adaa adac adad adao adcc adda addc addd addo adoc adod adoo aoca aza- azad azaz azca azo- azoo azza azzo c-cd caaa caac cac- caca cacc caco cada cadc cadd cado caod caoz caza cazo ccaa ccac ccad ccca cccc ccdc ccoc ccod cdaa cdac cdad cdda cdza coad coca coco coda codd cood cozd cozz daad daca dada dado dazz dcca dccc dddd ddoc doca doco dod- doda dodd dodo dood doza dozo dzca ocac ocad occa occc odac odda oddd odoo ooaa ooda oooo ozd zaca zada zaza zoco zoda zodd zoo- zoza zozo zzzz