inserting a lines in a file

Hi folks,

i need to insert the same set of lines between each line

input lines
111111
aaaaaa
333333

output should be
111111
1
2
3
aaaaaa
1
2
3
333333
1
2
3

It will be very useful if ou could give sme hints on the command you provide..

please help?

abc.txt holds the data you have mentioned .

awk '{print $0 ; printf "1\n2\n3\n" }' abc.txt

RESULT:
111111
1
2
3
aaaaaa
1
2
3
333333
1
2
3

Hope this helps.

thanks..mk1216