ddd ddi ddr ddt ddx ddy di- did dii dir dit dix diy drd dri drr drt drx dry dtd dti dtr dtt dtx dty dxd dxi dxr dxt dxx dy- dyd dyr dyy i-d idd idi idr idt idx idy iid iii iir iit iix ir- ird iri irr irt irx iry itd iti itt itx ity ixi ixy iyr iyt iyy rdd rdi rdr rdt rdx rdy rid rii rir rit rix riy rrd rri rrr rrt rtd rti rtr rtt rtx rty rxr ry- ryd ryr ryy t-x tdd tdi tdr tdt tdx tdy tid tii tir tit tix tiy trd tri trr trt trx try ttd tti ttr ttt ttx tty txi txt tyd tyr tyt xdi xdr xdt xii xit xix xrd xrt xrx xry xti xtr xtx xty xxi xxx xxy xyr xyy ydt ydy yid yii yir yit yrt ytd ytr ytt yxy yyt yyy