Intro
1|------------------------------------------------------------|
2|-----------1-------5-----------------1-------5---6----------|
3|---2---4-------2-------------2---4-------2-----------5------|
4|------------------------------------------------------------|
5|------------------------------------------------------------|
6|------------------------------------------------------------|
1|------------------------------------------------------------|
2|-----------1-------5-----------------1-------3--------------|
3|---2---4-------2-------------2---4-------2------------------|
4|------------------------------------------------------------|
5|------------------------------------------------------------|
6|------------------------------------------------------------|
1|------------------------------------------------------------|
2|-----------1-------5-----------------1-------5---6----------|
3|---2---4-------2-------------2---4-------2-----------5------|
4|------------------------------------------------------------|
5|------------------------------------------------------------|
6|------------------------------------------------------------|
1|---------------------------------------------------------------------|
2|-----------1-------5-----------------1-------5-------3-------6---5---|
3|---2---4-------2-------------2---4-------2---------------------------|
4|---------------------------------------------------------------------|
5|---------------------------------------------------------------------|