intro(x1) 1--------------------------- 2--------------------------- 3-333333-------------------- 4--------555555-666666-11111 1-------------------------- 2-------------------------- 3-3333333 4---------555555-6-5-3--1111 verso(x2) 1--------------------------- 2--------------------------- 3--3-3-3-3------------5----- 4----------5--3-3-3-3------- 1----------------------------- 2----------------------------- 3----------------------------- 4-1111111-333333-111111-333333 coro(x4) 1--------------------------- 2--------------------------- 3-333333-------------------- 4--------555555-666666-11111 1-------------------------- 2-------------------------- 3-3333333------------------ 4---------555555-6-5-3--1111 final 1----------------------------------- 2----------------------------------- 3-33333----------------------------- 4------55555-6-5-3-11111-6-5-3-11111