Il s'agit de LibreOffice DRAW. (désolé d'avoir oublié ce détail)
Il s'agirait de faire un schéma et, un peu comme dans les schémas
électriques, que lorsque 2 lignes se croisent, l'une fasse un "pont" pour
enkamber l'autre afin qu'il n'y ait aucune confusion dans la compréhension
du schéma.
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