5a3n1 4a3n 3a3n17 2a3n1 1a3n

gk2n fk2n17 ek2n1 dk2n ck2n17

rt1n17 qt1n1 pt1n ot1n17 nt1n1

220n1 120n 020n17 z20n1 y20n

dc0n cc0n17 bc0n1 ac0n 9b0n17