a-do aaaa aaab aaac aaad aaba aabb aabc aabd aaca aacb aacc aacd aaco aada aadc aaoo abaa abab abac abad abaj abb- abba abbb abbo abca abcb abcc abcd abda abdo aboa abob abod aboo acaa acab acac acad acba acca accc accd acco acda acdb acdc acoa acod adaa adab adac adad adao adba adbc adcc adda addc addd addo adja adob adoc adod adoo ajab ajac ajao ajba ajob ajoo aoba aoca baaa baad baba babb babo bac- baca bacc baco bada badb badd bado baja bbad bbbb bbdd bbdo bcaa bcbc bcca bccc bcda bd-j bdbc bddc bjcc bjoa boab boac boad boba bobb bobo boca boco boda bodb bodo bojd bojo boob booc bood c-bo c-cd caaa caab caac caba cabo cac- caca cacc caco cada cadc cadd cado caja caod cbac cbbc cbca cbcc cbdb cbdc cbdo ccaa ccab ccac ccad ccba ccbc ccca cccb cccc ccdc ccjo ccob ccoc ccod cdaa cdac cdad cdba cdda cddb cjad cjbc cjca cjcb cjcj cjdc cjob coad coba cobb cobo coca coco coda codd cojo coob cood d-bo daab daad daba dabb dabo daca dada dado daja dajc dbcc dcbc dcca dccb dccc dcdb dddd ddoc djao doab doba dobb doca doco dod- doda dodd dodo doja dojo doob dood jaba jabo jaca jacc jaco jada jado jaja jbaa jbob jcbc jccc jcda jjad jjcc joab joad joao joba jobo joca joco joda jodo jojo obad obba obbo obja ocab ocac ocad ocbc occa occc odac odbo odda oddd odoo ooaa ooba ooda oooo