5a4na
4a4n
3a4nab
2a4na
1a4n
gk3n
fk3nab
ek3na
dk3n
ck3nab
rt2nab
qt2na
pt2n
ot2nab
nt2na
221na
121n
021nab
z21na
y21n
dc1n
cc1nab
bc1na
ac1n
9b1nab