ddd ddi ddo ddp ddr dds ddx di- did dii dio dip dir dis dix dod doi doo dop dor dos dox dpd dpi dpo dpp dpr dps drd dri dro drp drr drs drx dsd dsi dso dsp dsr dss dsx dxd dxi dxo dxp dxr dxs dxx i-d idd idi ido idp idr ids idx iid iii iio iip iir iis iix io- iod ioi ioo iop ior ios ipd ipi ipo ipp ipr ips ipx ir- ird iri iro irp irr irs irx is- isd isi iso isp isr iss ixi o-i odd odi odo odp odr ods oid oii oio oip oir ois oo- ood ooi ooo oop oor oos oox op- opd opi opo opp opr ops opx or- ord ori oro orp orr ors orx os- osd osi oso osp osr oss osx ox- oxi oxo oxx p-p pdd pdi pdo pdp pdr pds pdx pid pii pio pip pir pis pix pod poi poo pop por pos pox ppd ppi ppo ppp ppr pps ppx prd pri pro prp prr prs prx ps- psd psi pso psp psr pss psx pxr pxs rdd rdi rdo rdp rdr rds rdx rid rii rio rip rir ris rix rod roi roo rop ror ros rox rpd rpi rpo rpp rpr rps rpx rrd rri rrp rrr rrs rsd rsi rso rsp rsr rss rsx rxp rxr rxs sdd sdi sdo sdp sdr sds sid sii sio sip sir sis six sod soi soo sop sor sos sox spd spi spo spp spr sps spx sr- srd sri sro srp srr srs srx ss- ssd ssi sso ssp ssr sss ssx sxi sxs xdi xdr xds xii xio xis xix xod xoi xoo xop xor xos xox xpd xpo xpp xps xrd xrx xsi xsp xss xxi xxo xxp xxx