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Append line from one text file to same line number of another file

cat numbers.txt ordinal.txt 
1
2
3
first
second
third

lam -s "--> " numbers.txt -s " as ordinal number: " numbers.txt 
--> 1 as ordinal number: 1
--> 2 as ordinal number: 2
--> 3 as ordinal number: 3