[layer]

rKNNNN
rKR..N
rKR..N
rKR..N
rKR..N
rKR..N
rKNNNN
???^

[layer]

??rKNN
??rKRN
??rKRN
??rKRN
??rKRN
??rKRN
??rKNN

[layer]

????r
????r
????r
????r
????r
????r
????r

