local x = setmetatable({},{
__index = function(t,k)
t[k] = setmetatable({},{
__index = function(t,k)
t[k] = 0
return t[k]
end
})
return t[k]
end
})
x[4][2] = 42
print("[4][2] : "..x[4][2])
print("[0][0] : "..x[0][0])
print("[10000000][154132148] : "..x[10000000][154132148])