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                | Math Logic | 
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	 	| Question : |  
	 		| What is a 'Sub-Sequence' ? |  
	 	| Answer :
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	 		| A sequence of a sequence. |  
	 		    | A subsequence 
                  of some sequence is a new sequence which is formed from the 
                  original sequence by deleting some of the elements without disturbing 
                  the positions of the remaining elements. |  
	 		    | For Example, |  
	 		    | <A,D,F> is a subsequence of <A,B,C,D,E,F> |  |