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From (T, U), possible base of the group of translations that leave the wallpaper unchanged, rhombus ABED is constructed: a repetitive pattern with its content. 6 equalities. And 6 arrows represent T, U, T ∘ U, which move silhouettes of birds.
À partir de (T, U), base possible du groupe des translations qui laissent inchangé le papier peint, le losange ABED est construit : un motif répétitif avec son contenu. Des flèches pour T, U ou T ∘ U, qui déplacent des silhouettes d’oiseaux.