Can someone review this short ahk script pls

I c&p it from someone. I dont know anything about ahk and chatgpt is useless. It keeps coming up with the "sendinput" variable hasnt been assigned a variable and line 25 not being able to execute. Thanks $x:: {Loop 2 sleep 1 SendInput e } {Loop 5 sleep 1 SendInput r } return $z:: {Loop 2 sleep 1 SendInput r } {Loop 5 sleep 1 SendInput e } return F1::Suspend