on join:
loop all items in player's inventory:
if loop-item is enchanted book:
if enchantment knockback of loop-item is set:
remove loop-item
send "&cSavurma büyü kitabı yasaklı! Silindi." to player
on join:
loop all items in player's inventory:
if enchantment knockback of loop-item is set:
remove loop-item
send "&cSavurma (Knockback) yasaklı! Item silindi." to player