Continuation
At the edge of the cliff, two trees mark the spot where you must stop, since any continuation requires a way across. The trees seem long enough to reach to the other side, but how are you going to chop them down?
れき
None
None
Continuation is impossible unless you chop these trees down to make a bridge to the other side. You decide to use a wrecking (れき) ball. Luckily, there's one right by you. So you take the wrecking ball and knock the trees over, making a bridge with them.