title: Séquence de blocs
include: gr.def
layout: b(ftftftft/n/s)b(ftftft/n/s)b(ftftftft/n/s)
step: 1
showt: b1 b2 b3
to: s1 s2 fhandle=right thandle=left
step: 2
to: s2 s3 fhandle=right thandle=left