private Long getMaskOrNull(char c)
	{
		
		if( c == 'T' || c =='t' )
			return T_LONG;
		
		if( c == 'G' || c =='g' )
			return G_LONG;
		
		if( c == 'C' || c =='c' )
			return C_LONG;
		
		if( c == 'A' || c == 'a')
			return A_LONG;
		
		return null;
		
	}