a-do aaaa aaab aaac aaad aaas aaba aabb aabc aabd aaca aacb aacc aacd aaco aacs aada aadc aads aaoo aasa aasc aasd aass abaa abab abac abad abas abb- abba abbb abbo abbs abca abcb abcc abcd abcs abda abdo aboa abob abod aboo abos abs- absa absd abss acaa acab acac acad acas acba acca accc accd acco accs acda acdb acdc acds acoa acod acos acsa acsc acsd acss adaa adab adac adad adao adas adba adbc adcc adcs adda addc addd addo adds adob adoc adod adoo ados adsa adso adss aoba aoca aocs aosd aoss asaa asab asac asad asao asas asba asbo asc- asca ascb ascc asco asda asdo asds asob asoc asod asos assa assc assd asso asss baaa baad baas baba babb babo babs bac- baca bacc baco bacs bada badb badd bado bads baos basa basc baso bass bbad bbas bbbb bbbs bbdd bbdo bcaa bcas bcbc bcbs bcca bccc bccs bcda bcds bcos bcsa bcsc bcss bdbc bddc bdos bdsd boab boac boad boas boba bobb bobo bobs boca boco bocs boda bodb bodo bods boob booc bood boos bosa bosc boso boss bsaa bsac bsas bsbd bscs bsod bsos bssc bssd c-bo c-cd caaa caab caac caas caba cabo cabs cac- caca cacc caco cada cadc cadd cado cads caod caos casa casb casc casd caso cass cbac cbbc cbbs cbca cbcc cbcs cbdb cbdc cbdo cbds cbsa cbsc ccaa ccab ccac ccad ccas ccba ccbc ccca cccb cccc cccs ccdc ccds ccob ccoc ccod ccsa ccsd ccss cdaa cdac cdad cdba cdcs cdda cddb cdos cdss coad coas coba cobb cobo cobs coca coco coda codd cods coob cood coos cosa cosc coso coss csaa csab csac csao csas cscb cscc cscd csco cscs csda csdb csob csos cssa cssd d-bo daab daad daas daba dabb dabo dabs daca dacs dada dado dads daos dasa dasb dasc dasd dass dbas dbcc dbcs dbos dbsa dbss dcas dcbc dcca dccb dccc dccs dcdb dcds dcos dcsc dcss dddd ddoc ddss doab doas doba dobb dobs doca doco docs dod- doda dodd dodo dods doob dood doos dosa doso doss dsac dsba dsbc dscc dscs dsda dsoa dsos dssa dssc oasc oass obad obas obba obbo obos obsd obss ocab ocac ocad ocas ocbc occa occc ocds ocos ocsa odac odas odbo odda oddd odds odoo odos odso ooaa ooba ooda oooo ooos oosa osas osba osca oscc osco osoo osos ossa ossb ossd osso s-os sa-c saab saac saad saas saba sabb sabc sabo sabs saca sacc sacd saco sacs sada sadb sadc sadd sado sads saos sasa sasc sasd saso sass sbaa sbac sbas sbbs sbca sbcc sbcs sbds sbsa sbsd scaa scab scac scad scas scba sccc sccs scda scdc scds scob scoo scsa scsc scsd scso sdba sdcc sdco sddc sdds sdsc sdss soad soas soba sobo sobs soca soco socs soda sodd sodo sods sood soos sosa soso soss ssaa ssab ssac ssao ssas ssca sscc sscs ssdc ssdd ssoc sssa sssb sssc ssss