right.hello
ra.ping
ra.return
left.hello
la.ping
la.return
ra.pong
right.return
la.pong
ra.ping
ra.return
ra.pong
left.return
left.hello
la.ping
la.return
la.pong
ra.ping
ra.return
ra.pong
left.return
right.hello
ra.ping
ra.return
left.hello
la.ping
la.return
ra.pong
right.return
la.pong
ra.ping
ra.return
ra.pong
left.return
left.hello
la.ping
la.return
la.pong
ra.ping
ra.return
ra.pong
left.return
