-er a-a a-b a-c aaa aab aac aae aah aaj aao aar ab- aba abb abc abe abh abj abo abr ac- aca acb acc ace ach acj aco acr aea aeb aec aee aeh aej aeo aer aha ahb ahc ahe ahh ahj aho ahr aja ajb ajc aje ajh ajj ajo ajr aoa aob aoc aoe aoh aoj aoo aor ar- ara arb arc are arh arj aro arr baa bab bac bae bah baj bao bar bba bbb bbc bbe bbh bbo bbr bca bcb bcc bce bch bcj bco bcr be- bea beb bec bee beh beo ber bha bhb bhc bhe bhh bhj bho bhr bja bjc bjj bjr boa bob boc boe boh boj boo bor bra brb bre brh brj bro brr c-- c-j caa cab cac cae cah caj cao car cba cbb cbc cbe cbh cbj cbo cbr cca ccb ccc cce cch ccj cco ccr ce- cea ceb cec cee ceh cej ceo cer ch- cha chb chc che chh cho chr cja cjb cjc cjr co- coa cob coc coe coh coj coo cor cra crb crc cre crh crj cro crr eaa eab eac eae eah eaj eao ear eba ebb ebc ebe ebh ebj ebo ebr ec- eca ecb ecc ece ech ecj eco ecr eea eeb eec eee eeo eer eha ehb ehc ehe ehh eho ehr eja ejc ejo eo- eoa eob eoc eoe eoh eoo eor era erb erc ere erh ero err haa hab hac hae hah haj hao har hba hbb hbc hbe hbh hbj hbo hbr hca hcb hcc hce hch hcj hco hcr he- hea heb hec hee heh hej heo her hha hhb hhc hhe hhh hhj hho hhr hja hjo hjr hoa hob hoc hoe hoh hoo hor hr- hra hrb hrc hre hrh hrj hro hrr jaa jab jac jae jah jaj jao jar jba jbc jbj jbo jbr jca jcb jcc jce jch jco jcr jea jeb jec jee jeh jej jeo jer jha jhc jhe jhj jho jhr jja jjb jjc jjj jjr joa job joc joe joh joj joo jor jra jrb jrc jro jrr oaa oab oac oae oah oaj oao oar ob- oba obb obc obe obh obj obo obr oc- oca ocb occ och ocj oco ocr oea oeb oec oee oeh oeo oer oha ohc ohe ohh oho ohr oja ojb ojc oje ojo oo- ooa oob ooc ooh ooo oor or- ora orb orc ore orh oro orr ra- raa rab rac rae rah raj rao rar rba rbb rbc rbe rbh rbo rbr rca rcb rcc rce rch rcj rco rcr re- rea reb rec ree reh reo rer rh- rha rhb rhc rhe rhh rho rhr rja rjc rjr roa rob roc roe roh roj roo ror rra rrb rrc rrh rrr