~@deb:~/perl/9# cat file1
A       B       12.00
C       D       13.00
E       F       11.00
G       H       22.00
~@deb:~/perl/9# cat file2
1       A       B       01.00
2       C       D       04.00
3       E       F       42.00
4       G       H       34.00
~@deb:~/perl/9# cat file3
A       B       02.00
C       D       03.00
E       F       15.00
G       H       20.00
~@deb:~/perl/9# cat file4
1       A       B       62.00
2       C       D       43.00
3       E       F       24.00
4       G       H       26.00