Not really sure...

----LUA----
Print("This is a list of items you can have on your adventure")
textutils.slowPrint("Cross bow, Bolts, Fire Starter, Knife, Axe, Hammer, 10 rations, Water Skin, Leather Armor", 100)
textutils.slowprint("You have enough space for four of these items")

Function InventoryChecker1()
print("First item selected please select next item")

repeat
local slot1 = read(*)
    if slot1 =~ "Cross bow" or "Bolts" or "Fire STarter" or "Knife" or "Axe" or "Hammer" or "10 rations" or "Water skin" or "Leather Armor" Then
        print("That item is not a choice please try again")
            until slot1 == "Cross bow" or "Bolts" or "Fire Starter" or "Knife" or "Axe" or "Hammer" or "10 rations" or "Water skin" or "Leather Armor"
    end
end

Function InventoryChecker2()
print("First item selected please select next item")

repeat
local slot2 = read(*)
    if slot2 =~ "Cross bow" or "Bolts" or "Fire STarter" or "Knife" or "Axe" or "Hammer" or "10 rations" or "Water skin" or "Leather Armor" Then
        print("That item is not a choice please try again")
            until slot2 == "Cross bow" or "Bolts" or "Fire Starter" or "Knife" or "Axe" or "Hammer" or "10 rations" or "Water skin" or "Leather Armor"
    end
end

Function InventoryChecker3()
print("First item selected please select next item")

repeat
local slot3 = read(*)
    if slot3 =~ "Cross bow" or "Bolts" or "Fire STarter" or "Knife" or "Axe" or "Hammer" or "10 rations" or "Water skin" or "Leather Armor" Then
        print("That item is not a choice please try again")
            until slot3 == "Cross bow" or "Bolts" or "Fire Starter" or "Knife" or "Axe" or "Hammer" or "10 rations" or "Water skin" or "Leather Armor"
    end
end

Function InventoryChecker4()
print("First item selected please select next item")

repeat
local slot4 = read(*)
    if slot4 =~ "Cross bow" or "Bolts" or "Fire STarter" or "Knife" or "Axe" or "Hammer" or "10 rations" or "Water skin" or "Leather Armor" Then
        print("That item is not a choice please try again")
            until slot4 == "Cross bow" or "Bolts" or "Fire Starter" or "Knife" or "Axe" or "Hammer" or "10 rations" or "Water skin" or "Leather Armor"
    end
end

Function Inventorychecker()
    local Invchk = Inventory
    If read == "Inventory" then
        print (slot1 , slot2 , slot3 , slot 4)