--------------------------------------------------|
------------11b10---------------------------------|
-----10b12--------10b0----10b12--10b0-------------|     (x3)
-1212----------------------------------10-10-12---|
--------------------------------------------------|
--------------------------------------------------|

then..

-----------------------------------------|
-----------------------------------------|
---7b0-10b0-7b0-10b12-10b0---------------|
----------------------------10-10-12-----|              (x1)
-----------------------------------------|
-----------------------------------------|