ex issue72
issue73, pas 72
exemple pour debug
simplification de l'exemple
encore simplifions
Revert "encore simplifions"

This reverts commit 672c0187a9b7a9ef373c259f3b624a9814b6c07b.
simplification
simplification
simplification
simplification
simplification
simplification
simplification
simplification
simplification
simplification
simplification
simplification
etendons l'exemple
simplifions