t15n2 s15n r15n20 q15n2 p15n
4a5n 3a5n20 2a5n2 1a5n 0a5n20
fk4n20 ek4n2 dk4n ck4n20 bk4n2
qt3n2 pt3n ot3n20 nt3n2 mt3n
122n 022n20 z22n2 y22n x22n20