Subtask 
-------- 
Dilation SE1
Dilation SE7
 Erosion SE1
 Erosion SE7
Iterate 2 Dilation SE1
Iterate 2  Erosion SE1

Subtask 
-------- 
Dilation SE1
Dilation SE5
 Erosion SE1
 Erosion SE5
Iterate 2 Dilation SE1
Iterate 2  Erosion SE1

Subtask 
-------- 
Dilation SE4
Dilation SE1
 Erosion SE4
 Erosion SE1
Iterate 2 Dilation SE1
Iterate 2  Erosion SE1