-er bbb bbc bbe bbh bbl bbr bcb bcc bce bch bcl bcr be- beb bec bee beh bel ber bhb bhc bhe bhh bhl bhr blb blc ble blh bll blr brb bre brh brl brr c-- cbb cbc cbe cbh cbl cbr ccb ccc cce cch ccl ccr ce- ceb cec cee ceh cel cer ch- chb chc che chh chl chr cl- clb clc cle clh cll clr crb crc cre crh crl crr ebb ebc ebe ebh ebl ebr ec- ecb ecc ece ech ecl ecr eeb eec eee eel eer ehb ehc ehe ehh ehl ehr elb elc ele elh ell elr erb erc ere erh erl err hbb hbc hbe hbh hbl hbr hcb hcc hce hch hcl hcr he- heb hec hee heh hel her hhb hhc hhe hhh hhl hhr hlb hlc hle hlh hll hlr hr- hrb hrc hre hrh hrl hrr lbb lbc lbe lbh lbl lbr lcb lcc lce lch lcl lcr leb lec lee leh lel ler lhb lhc lhh lhr llb llc lle lll llr lrb lrc lrh lrr rbb rbc rbe rbh rbl rbr rcb rcc rce rch rcl rcr re- reb rec ree reh rel rer rh- rhb rhc rhe rhh rhl rhr rlc rle rlh rll rlr rrb rrc rrh rrl rrr