-er a-a a-b a-c aaa aab aac aae aah aar aav ab- aba abb abc abe abh abr abv ac- aca acb acc ace ach acr acv aea aeb aec aee aeh aer aev aha ahb ahc ahe ahh ahr ahv ar- ara arb arc are arh arr arv av- ava avb avc ave avh avr baa bab bac bae bah bar bav bba bbb bbc bbe bbh bbr bca bcb bcc bce bch bcr bcv be- bea beb bec bee beh ber bev bha bhb bhc bhe bhh bhr bhv bra brb bre brh brr brv bva bvb bvc bve bvh bvr bvv c-- caa cab cac cae cah car cav cba cbb cbc cbe cbh cbr cbv cca ccb ccc cce cch ccr ccv ce- cea ceb cec cee ceh cer cev ch- cha chb chc che chh chr chv cra crb crc cre crh crr crv cva cvb cvc cve cvh cvr cvv eaa eab eac eae eah ear eav eba ebb ebc ebe ebh ebr ebv ec- eca ecb ecc ece ech ecr ecv eea eeb eec eee eer eev eha ehb ehc ehe ehh ehr ehv era erb erc ere erh err erv eva evb evc eve evh evr evv haa hab hac hae hah har hav hba hbb hbc hbe hbh hbr hbv hca hcb hcc hce hch hcr hcv he- hea heb hec hee heh her hev hha hhb hhc hhe hhh hhr hhv hr- hra hrb hrc hre hrh hrr hrv hv- hva hvb hvc hvr hvv ra- raa rab rac rae rah rar rav rba rbb rbc rbe rbh rbr rca rcb rcc rce rch rcr rcv re- rea reb rec ree reh rer rev rh- rha rhb rhc rhe rhh rhr rhv rra rrb rrc rrh rrr rva rvb rvc rve rvh rvr rvv v-a v-e vaa vab vac vae vah var vav vba vbc vbh vbr vbv vca vcc vce vch vcr vea veb vec vee veh ver vh- vha vhb vhc vhe vra vrb vrc vre vrh vrr vva vvb vvc vvr vvv