-er a-a a-b a-c aaa aab aac aad aae aah aak aar ab- aba abb abc abd abe abh abk abr ac- aca acb acc acd ace ach ack acr ad- ada adb adc add ade adh adk adr aea aeb aec aed aee aeh aek aer aha ahb ahc ahd ahe ahh ahk ahr aka akb akc akd ake akh akk akr ar- ara arb arc ard are arh ark arr baa bab bac bad bae bah bak bar bba bbb bbc bbd bbe bbh bbk bbr bca bcb bcc bcd bce bch bck bcr bda bdb bdc bdd bde bdh bdk bdr be- bea beb bec bed bee beh bek ber bha bhb bhc bhd bhe bhh bhk bhr bka bkb bkc bke bkk bkr bra brb brd bre brh brk brr c-- caa cab cac cad cae cah cak car cba cbb cbc cbd cbe cbh cbk cbr cca ccb ccc ccd cce cch cck ccr cda cdb cdc cdd cde cdh cdk cdr ce- cea ceb cec ced cee ceh cek cer ch- cha chb chc chd che chh chk chr cka ckb ckc ckd ckh cra crb crc crd cre crh crk crr daa dab dac dad dae dah dak dar dba dbb dbc dbd dbe dbh dbk dbr dca dcb dcc dcd dce dck dcr dda ddb ddc ddd dde ddh ddk ddr de- dea deb dec ded dee deh dek der dh- dha dhb dhc dhd dhe dhh dhk dhr dka dkb dkc dke dkk dkr dra drb drc drd dre drk drr eaa eab eac ead eae eah eak ear eba ebb ebc ebd ebe ebh ebk ebr ec- eca ecb ecc ecd ece ech eck ecr ed- eda edb edc edd ede edh edk edr eea eeb eec eed eee eek eer eha ehb ehc ehd ehe ehh ehr eka ekb ekc ekd eke ekh ekr era erb erc erd ere erh erk err haa hab hac had hae hah hak har hba hbb hbc hbd hbe hbh hbk hbr hca hcb hcc hcd hce hch hck hcr hda hdb hdc hdd hde hdh hdk hdr he- hea heb hec hed hee heh hek her hha hhb hhc hhd hhe hhh hhk hhr hka hkb hkd hkh hkk hkr hr- hra hrb hrc hrd hre hrh hrk hrr ka- kaa kab kac kad kae kah kak kar kba kbb kbc kbd kbe kbh kbk kbr kca kcb kcc kcd kce kch kck kcr kda kdb kdc kde kdh kdk kdr ke- kea keb kec ked kee keh kek ker kha khe khh khk khr kkb kkc kke kkh kkk kkr kra krc krd krk krr ra- raa rab rac rad rae rah rak rar rba rbb rbc rbd rbe rbh rbk rbr rca rcb rcc rcd rce rch rcr rda rdb rdc rdd rde rdh rdr re- rea reb rec red ree reh rek rer rh- rha rhb rhc rhd rhe rhh rhr rkb rkc rke rkk rra rrb rrc rrd rrh rrk rrr