-er -th bbb bbe bbh bbi bbo bbr bbt bbx be- beb bee beh bei beo ber bet bex bhb bhe bhh bhi bho bhr bht bhx bi- bib bie bih bii bio bir bit bix bob boe boh boi boo bor bot box brb bre brh bri bro brr brt brx btb bte bth bti bto btr btt btx bxb bxi bxo bxx ebb ebe ebh ebi ebo ebr ebt ebx eeb eee eeo eer eet eex ehb ehe ehh ehi eho ehr eht eib eie eii eio eir eit eix eo- eob eoe eoh eoi eoo eor eot erb ere erh eri ero err ert etb ete eth eti eto etr ett etx ex- exe exh exi exo exr ext exx h-i hbb hbe hbh hbi hbo hbr hbt hbx he- heb hee heh hei heo her het hex hhb hhe hhh hhi hho hhr hht hib hie hih hii hio hir hit hix hob hoe hoh hoi hoo hor hot hox hr- hrb hre hrh hri hro hrr hrt htb hte hth hti hto htr htt htx ibb ibe ibh ibi ibo ibr ibt ibx ie- iee iei ier iet iex ihb ihe ihh ihi iho ihr iht iib iie iih iii iio iir iit iix io- iob ioe ioh ioi ioo ior iot ir- irb ire iri iro irr irt irx itb ite ith iti ito itt itx ixe ixi o-i ob- obb obe obh obi obo obr obt obx oeb oee oeh oei oeo oer oet oex ohe ohh ohi oho ohr oht oib oie oii oio oir oit oo- oob ooh ooi ooo oor oot oox or- orb ore orh ori oro orr ort orx ot- otb ote oth oti oto otr ott ox- oxb oxi oxo oxt oxx rbb rbe rbh rbi rbo rbr rbt rbx re- reb ree reh rei reo rer ret rex rh- rhb rhe rhh rhi rho rhr rht rib rie rih rii rio rir rit rix rob roe roh roi roo ror rot rox rrb rrh rri rrr rrt rtb rte rti rto rtr rtt rtx rxr t-x tbb tbe tbh tbi tbo tbr tbt te- teb tee teh tei teo ter tet tex th- thb the thh thi tho thr tht thx tib tie tih tii tio tir tit tix to- tob toe toh toi too tor tot tox trb tre trh tri tro trr trt trx ttb tte tth tti tto ttr ttt ttx txe txi txt xbe xbr xbx xee xer xet xex xht xie xii xio xit xix xoi xoo xor xot xox xrt xrx xti xtr xtx xxi xxo xxx