alpha-num numbering scheme in perl

Hi,
Does anyone know how to get the alpha-numeric numbering scheme in perl ?
For example the
numberic => 0,1,2,...9,10,11,12,...99,100,... # $x = 0;$x++;
lower-alpha => a,b,c,...z,aa,ab,ac,...zz,aaa,... # $x = "a";$x++;
upper-alpha => A,B,C,..,Z,AA,AB,AC,...ZZ,AAA,... # $x = "A";$x++;
lower-alpha-num => a,b,c,...z,0,1,2,3,...9,aa,ab,ac,...zz,10,11,12,.. .99,aaa,... # ?
upper-alpha-num => A,B,C,..,Z,0,1,2,3,...9,AA,AB,AC,...ZZ,10,11,12,.. .99,AAA,... # ?

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re: alpha-num numbering scheme in perl

what a jerk....... would someone whack this guys pee-pee