def formatLines(lst):
    result = lst[0]
    count = 0
    for item in lst:
        count = count + 1
        if count == 5:
            count = 0
            result = result + "\n" + item
        else:
            result = result + " "
            result = result + item
    return result



output:

words_3.txt
body body cold ence four
from into just late less
life live man
 more more
more more more pain pain
part race rest rest some
some sons take take than
than than that that they
this this when with with
with with

expected output:

words_3.txt
age all and and and
and and and and and
but but can dav eit
end ers for for fre
gen has has his his
man men not off old
one sex six six the
the the the the the
the the the the the
the the