How to make ruler in Little Alchemy

To make ruler in Little Alchemy you have to combine this elements:

1. pencil + wood

Ruler Step by Step

How do I combine the necessary elements to create ruler in Little Alchemy?
Here we show you the walkthrough, just follow the steps below:

1 earth + water = mud

2 earth + fire = lava

3 air + fire = energy

4 air + air = pressure

5 air + water = rain

6 earth + rain = plant

7 air + lava = stone

8 fire + stone = metal

9 air + stone = sand

10 fire + sand = glass

11 plant + pressure = coal

12 mud + plant = swamp

13 energy + swamp = life

14 earth + life = human

15 glass + sand = time

16 human + metal = tool

17 plant + time = tree

18 tool + tree = wood

19 coal + wood = pencil

20 pencil + wood = ruler

Below you can see a video tutorial on how to make ruler in Little Alchemy:

Combinations with other elements are not yet known.