on anvil prepare:
    if slot 0 of event-inventory is a diamond pickaxe of efficiency 5:
        if slot 1 of event-inventory is an enchanted book:
            if stored enchants of slot 1 of event-inventory contains Efficiency 5:
                set {_i} to slot 0 of event-inventory
                set line 1 of the lore of {_i} to "&aWydajność VI/X"
                enchant {_i} with Efficiency 6
                set event-slot to {_i}
                set repair cost of event-inventory to 30
        if slot 1 of event-inventory is an enchanted book:
            if stored enchants of slot 1 of event-inventory contains Efficiency 6:
                set {_i} to slot 0 of event-inventory
                set line 1 of the lore of {_i} to "&aWydajność VII/X"
                enchant {_i} with Efficiency 7
                set event-slot to {_i}
                set repair cost of event-inventory to 40
            if stored enchants of slot 1 of event-inventory contains Efficiency 7:
                set {_i} to slot 0 of event-inventory
                set line 1 of the lore of {_i} to "&aWydajność VIII/X"
                enchant {_i} with Efficiency 8
                set event-slot to {_i}
                set repair cost of event-inventory to 50
            if stored enchants of slot 1 of event-inventory contains Efficiency 8:
                set {_i} to slot 0 of event-inventory
                set line 1 of the lore of {_i} to "&aWydajność IX/X"
                enchant {_i} with Efficiency 9
                set event-slot to {_i}
                set repair cost of event-inventory to 50
            if stored enchants of slot 1 of event-inventory contains Efficiency 9:
                set {_i} to slot 0 of event-inventory
                set line 1 of the lore of {_i} to "&aWydajność X/X MAX"
                enchant {_i} with Efficiency 10
                set event-slot to {_i}
                set repair cost of event-inventory to 50