(@positive,@negative) = separate_positive_negative()




create_Unique_test_heirarchy{
	$genus =  shift;
	
	withing all species of genus 	
	(@positive,@negative) = separate_positive_negative()	
	
	creat two groups of positive and negative test	
	for each group (+ve and -ve)
		again separate on the basis of + and - membrane till the separtion of last group