Are there any Boolean function that helps to identify the block in the sequence.

Question

consider a bit stream $$S = 000,010,100,111,011,001,101,110,011,110,111 $$I divide these in to two bit streams(blocks) $$000,010,100,111,011 $$ $$001,101,110,011,110,111 $$ now is there any Boolean function or any other criteria that given S I should be able to identify the block one and two.