question: stairs:floor
choices.label: A B C D
choices.text: train:railway station bridge:river bank telephone:phone line letters:post office
explanation: the "floors" are connected by "stairs". "railway station" stops "train", but has no connectivity. the "river bank" is connected by "bridges". "phone line" is part of "telephone". "letters" are delivered through the "post office", but the corresponding method is different from the query.
relation: stairs floor R3.10
relation: bridge river bank R3.10
relation: phone line telephone R2.3
relation: post office letters R3.10