a-a a-b a-c aaa aab aac aae aas aav ab- aba abb abc abe abs abv ac- aca acb acc ace acs acv aea aeb aec aee aes aev as- asa asb asc ase ass asv av- ava avb avc ave avs baa bab bac bae bas bav bba bbb bbc bbe bbs bca bcb bcc bce bcs bcv be- bea beb bec bee bes bev bsa bsb bsc bse bss bsv bva bvb bvc bve bvs bvv c-- caa cab cac cae cas cav cba cbb cbc cbe cbs cbv cca ccb ccc cce ccs ccv ce- cea ceb cec cee ces cev csa csb csc cse css csv cva cvb cvc cve cvs cvv eaa eab eac eae eas eav eba ebb ebc ebe ebs ebv ec- eca ecb ecc ece ecs ecv eea eeb eec eee ees eev es- esa esb esc ese ess esv eva evb evc eve evs evv saa sab sac sae sas sav sba sbb sbc sbe sbs sbv sca scb scc sce scs scv se- sea seb sec see ses sev ss- ssa ssb ssc sse sss ssv sva svb svc sve svs svv v-a v-e vaa vab vac vae vas vav vba vbc vbs vbv vca vcc vce vcs vea veb vec vee ves vsa vsb vsc vse vss vsv vva vvb vvc vvs vvv