Subtask 
-------- 
Dilation SE4
Dilation SE5
 Erosion SE4
 Erosion SE5
Dilation SE6
Dilation SE1
 Erosion SE6
 Erosion SE1

Subtask 
-------- 
Dilation SE5
Dilation SE4
 Erosion SE5
 Erosion SE4
Dilation SE6
Dilation SE1
 Erosion SE6
 Erosion SE1

Subtask 
-------- 
Dilation SE7
Dilation SE8
 Erosion SE7
 Erosion SE8
Dilation SE6
Dilation SE1
 Erosion SE6
 Erosion SE1