Please note that you have an error in your code, you've got 01 for example displayed more than once, (I got obviously late in posting)

79.

$_=join'',('00'..'99');1while(s/(..)(.*)\1/$1$2/);1while(s/(.)\1\1/$1$1/);print 123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789

75. (removed stupid parnes)

$_=join'','00'..'99';1while s/(..)(.*)\1/$1$2/;1while s/(.)\1\1/$1$1/;print 123456789 123456789 123456789 123456789 123456789 123456789 123456789 12345

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