on drop:
    if player is holding a diamond pickaxe:
        cancel event
on drop:
    if player is holding a book:
        cancel event

on inventory click:
    clicked slot is 2:
        cancel event

on inventory click:
    clicked slot is 1:
        cancel event

on inventory click:
    clicked slot is 7:
        cancel event

on inventory click:
    clicked slot is 8:
        cancel event

on inventory click:
    clicked slot is 9:
        cancel event