t0if1 s0if r0if1x q0if1 p0if
49hf 39hf1x 29hf1 19hf 09hf1x
fjhf1x ejhf1 djhf cjhf1x bjhf1
qsgf1 psgf osgf1x nsgf1 msgf
11ff 01ff1x z1ff1 y1ff x1ff1x