Lines of Strings

[Reem Mohammed]

Hi

Suppose we have data file like this one (Consider all lines as strings )

1 2 3 3 4 4 4 4 5 6
2 2 2 5 5 5 6
3 2 1 1 1 3 3 3 4 6

I would like to remove line if its belong to another one, and will be able 
to do this if longer line come after a short one.

Thanks

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