Get un common numbers from two files

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# 1  
Get un common numbers from two files

I have two files:

abc :




How to get all the numbers from cde which are not in abc?

result must be :

Thanks for your help.
# 2  
sort the files in ascending order then use comm
sort -o abc
sort -o cde
comm -13 > resultfile

# 3  
grep -vf abc cde
# 4  
Above one works with /usr/xpg4/bin/grep not with
/usr/xpg4/bin/grep -vf a b
Not this one /usr/bin/grep

Thought will save soe time to others as I went through man to figure this out

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