Answers

(1)辺BC.辺AD.辺CG.辺DH

(2)辺AE.辺DH.辺CG

(3)辺AE.辺DH.辺FE.辺GH
*ねじれの位置
→平行でなく交わらない辺

(4)面BFGC.面AEFB.面DHGC.面AEHD

説明は、ちょっと難しいです…
ごめんなさい

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