1. pin   pine   cedar   elm   maple   Hint Half-n-half Clue   2. arbre de châtaigne   birch   oak   chestnut   poplar   Half-n-half Clue   3. sapin   pine   fir   poplar   oak   Half-n-half Clue   4. peuplier   maple   chestnut   poplar   fir   Half-n-half Clue   5. cèdre   beech   pine   cedar   birch   Half-n-half Clue   6. hêtre   chestnut   beech   fir   elm   Half-n-half Clue   7. bouleau   cedar   maple   beech   birch   Half-n-half Clue