Replacement by dictionary possible with AWK or Sed? [closed]

Answer 1

EDIT

This answers the original post. doesn't answer the multiple times edited and restructured question... on top of that I get a -1 from the OP who asked this question... Damn!

Yes, much simpler in awk :

This will print both column as the value for the second column :

awk '{print $2, $2}' file

If you want to flip first with second column:

awk '{print $2, $1}' file