Subtask 
-------- 
Dilation SE7
Dilation SE1
 Erosion SE7
 Erosion SE1
Iterate 3 Dilation SE4
Iterate 3  Erosion SE4

Subtask 
-------- 
Dilation SE1
Dilation SE7
 Erosion SE1
 Erosion SE7
Iterate 3 Dilation SE4
Iterate 3  Erosion SE4

Subtask 
-------- 
Dilation SE6
Dilation SE7
 Erosion SE6
 Erosion SE7
Iterate 3 Dilation SE4
Iterate 3  Erosion SE4