-th hhh hho hhr hhs hht hoh hoo hor hos hot hox hr- hrh hro hrr hrs hrt hsh hsr hss hst hsx hth hto htr hts htt htx ohh oho ohr ohs oht oo- ooh ooo oor oos oot oox or- orh oro orr ors ort orx os- osh oso osr oss ost osx ot- oth oto otr ots ott ox- oxo oxt oxx rh- rhh rho rhr rhs rht roh roo ror ros rot rox rrh rrr rrs rrt rsh rso rsr rss rst rsx rto rtr rts rtt rtx rxr rxs sh- shh sho shr shs sht soh soo sor sos sot sox sr- srh sro srr srs srt srx ss- ssh sso ssr sss sst ssx sth sto str sts stt stx sxs sxt t-x th- thh tho thr ths tht thx to- toh too tor tos tot tox trh tro trr trs trt trx tsh tso tsr tss tst tsx tth tto ttr tts ttt ttx txs txt xht xoo xor xos xot xox xrt xrx xss xst xtr xts xtx xxo xxx