title: Comment ça fonctionne
include: gr.def
layout: ttt/tt/tt
step: 1
showt: t1 t2 t3 t4 t5 t6 t7
to: t1 t4
to: t2 t4
to: t3 t4
step: 2
to: t4 t6
to: t5 t6
step: 3
to: t4 t7