Spoil
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Put all 4 items in one person's inventory, then move that person as close to each pipe as you can, in the proper order, then just mouse click on pipe where it projects over the water. You should get the 'manipulate' cursor. If you do it in correct order, you will see a sort of miniature fireball effect as the pipe accepts the item.
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Smile! Life is too short for bitching!
Fljotsdale