pmi pml pmm pmo pmp pms pob poc pod poh poi pol pom poo pop pos poy ppb ppc ppd pph ppi ppl ppm ppo ppp pps ps- psb psc psd psh psi psl psm pso psp pss psy py- pyb pyc pyd pyl pym pyo pys sbb sbc sbd sbh sbi sbl sbm sbo sbp sbs sby scb scc scd sch sci scl scm sco scp scs sdb sdc sdd sdh sdi sdl sdm sdo sdp sds sdy sh- shb shc shd shh shi shl shm sho shp shs shy sib sic sid sih sii sil sim sio sip sis slb slc sld slh sli sll slm slo slp sls sly smb smc smd smh smi sml smm smo smp sms smy sob soc sod soh soi sol som soo sop sos soy spb spc spd sph spi spl spm spo spp sps spy ss- ssb ssc ssd ssh ssi ssl ssm sso ssp sss sy- syb syc syd syh syi syl sym syp sys ybc ybi ybl ybm ybp ybs yby ycc ycd ych yci ycl yco ycp ycs ycy ydl ydo yds ydy yhc yhi yhs yid yih yii yim yio yip yis ylc yld yli yll ylm yls yly ymc ymi yml ymm ymo yms yob yoc yod yoi yol yom yoo yop yos yoy ypd ypl ypo yps ysb ysc ysi ysl ysm yso ysp yss ysy yyb yyc yys yyy