-er bbb bbc bbe bbo bbr bcb bcc bce bcj bco bcr be- beb bec bee beo ber bjc bjj bjr bob boc boe boj boo bor brb bre brj bro brr c-- c-j cbb cbc cbe cbj cbo cbr ccb ccc cce ccj cco ccr ce- ceb cec cee cej ceo cer cjb cjc cjr co- cob coc coe coj coo cor crb crc cre crj cro crr ebb ebc ebe ebj ebo ebr ec- ecb ecc ece ecj eco ecr eeb eec eee eeo eer ejc ejo eo- eob eoc eoe eoo eor erb erc ere ero err jbc jbj jbo jbr jcb jcc jce jco jcr jeb jec jee jej jeo jer jjb jjc jjj jjr job joc joe joj joo jor jrb jrc jro jrr ob- obb obc obe obj obo obr oc- ocb occ ocj oco ocr oeb oec oee oeo oer ojb ojc oje ojo oo- oob ooc ooo oor or- orb orc ore oro orr rbb rbc rbe rbo rbr rcb rcc rce rcj rco rcr re- reb rec ree reo rer rjc rjr rob roc roe roj roo ror rrb rrc rrr