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How to find frequent occurance of a word in a line?

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# 1  
Old 06-16-2011
How to find frequent occurance of a word in a line?
File_source.DAT
1|abc|abc|abc|abc|abc
2|abc|abc|efg|efg|def
3|abc|bcd|cde|def|efg
4|abc|abc|abc|def|efg
=========================
Please help me to solve this as below using UNIX.
=========================
File_output.DAT
"1"|"abc" - as abc is the most occured in this line
"2"|"NOT DETERMINED"- abc and efg both repeted twice
"3"|"NOT DETERMINED"- as all are distinct
4|abc - as abc is the most occured in this line
# 2  
Old 06-16-2011
home work Smilie

what you tried so far ?
# 3  
Old 06-16-2011
i tried counting the strings, but not able to imply 2,3 and the comparisons in between..is there any function equivalent to handle.
# 4  
Old 06-16-2011
it will be gr8 if you could share what you have tried in commands Smilie we can help you to proceed...
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