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The requirements are:
If char 3-5 is in the convert file
If char 3-5 and 138-140 match
convert both
else
convert char 3-5
replace char 138-140 with spaces
fi
fi
in awk you can use the function substr to get char3-5 or similar, so looks pretty easy to check.
conversion and replacement also easy, you need to split your line into 5 pieces: before 3, 3-5, 6-137, 138-140, 141- and construct the result by concatenating required parts.
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