I1--------------------SM1

M1--------------------SQ1
		     |TT1

T1--------------------RQ1
                     |SQ2
		     |RM1
		     |SM2

M2--------------------TT2

T2--------------------RQ2
		     |SQ3
		     |RM2
		     |SM3

M3--------------------TT3

T3--------------------RQ3
		     |SQ2
		     |RM3
		     |SM4

M4--------------------TT4

T4--------------------RQ2
		     |RM4
    		     |SM1


Ì2-------------------RM1
   		    |RM2
 		    |RM3
		    |RM4
  		    |RQ1
		    |RQ2
		    |RQ3