|------------------- |------------------- |------------------- |------------------- |-------0-1/2-0----- |-0-0-3---------3-0- X2 |------------------- |------------------- |------------------- |-------0-0/1-0----- |-0-0-3---------3--- |------------------- X2 |------------------- |------------------- |------------------- |------------------- |-------0-1/2-0----- |-0-0-3---------3-0- X2