ddd ddi ddl ddp dds ddt di- did dii dil dip dis dit dl- dld dli dll dlp dls dlt dpd dpi dpl dpp dps dpt dsd dsi dsl dsp dss dst dtd dti dtl dtp dts dtt i-d idd idi idl idp ids idt iid iii iil iip iis iit il- ild ili ill ilp ils ilt ipd ipi ipl ipp ips ipt is- isd isi isl isp iss ist itd iti itl itp its itt l-p ldd ldi ldl ldp lds ldt lid lii lil lip lis lit lld lli lll llp lls llt lpd lpi lpl lpp lps lpt lsd lsi lsl lsp lss lst ltd lti ltl ltp lts ltt p-p pdd pdi pdl pdp pds pdt pid pii pil pip pis pit pld pli pll plp pls plt ppd ppi ppl ppp pps ppt ps- psd psi psl psp pss pst pt- ptd pti ptl ptp pts ptt sdd sdi sdl sdp sds sdt sid sii sil sip sis sit sld sli sll slp sls slt spd spi spl spp sps spt ss- ssd ssi ssl ssp sss sst std sti stl stp sts stt tdd tdi tdl tdp tds tdt tid tii til tip tis tit tld tli tll tlp tls tlt tpd tpi tpl tpp tps tpt tsd tsi tsl tsp tss tst ttd tti ttl ttp tts ttt