ddd ddi dds ddt ddy di- did dii dis dit diy dsd dsi dss dst dsy dtd dti dts dtt dty dy- dyd dys dyy i-d idd idi ids idt idy iid iii iis iit is- isd isi iss ist isy itd iti its itt ity iys iyt iyy sdd sdi sds sdt sdy sid sii sis sit ss- ssd ssi sss sst std sti sts stt sty sy- syd syi sys syt tdd tdi tds tdt tdy tid tii tis tit tiy tsd tsi tss tst tsy ttd tti tts ttt tty tyd tys tyt yds ydt ydy yid yii yis yit ysi yss yst ysy ytd yts ytt yys yyt yyy