C++ Sort a vector of vector of strings with comparator. Please help me understand

C++ Sort a vector of vector of strings with comparator. Please help me
understand

References

Reference NO 1

http://stackoverflow.com/questions/15185797/c-sort-a-vector-of-vector-of-strings-with-comparator-please-help-me-understan

Reference NO 2

http://stackoverflow.com/questions/5058443/c-how-to-compare-several-vectors-then-make-a-new-sorted-vector-that-contains

Reference NO 3

http://www.cplusplus.com/forum/beginner/12089/

Reference NO 4

http://www.codeproject.com/Articles/38381/STL-Sort-Comparison-Function

Reference NO 5

http://www.daniweb.com/software-development/cpp/threads/330009/how-to-remove-duplicate-words-after-sorting-a-text-

Reference NO 6

http://www.drdobbs.com/the-standard-librarian-sorting-in-the-st/184403792

Reference NO 7

http://www.java-samples.com/showtutorial.php?tutorialid=220

Reference NO 8

#EANF#