OBBL Ideas		 Tree
OBBL Help

Hints:

* Use thumbtacks to support the ends of the bottom branch.

* You can place more thumbtacks to support the whole bottom branch, then replace the thumbtacks with bubbles after you have placed the triangles.

* For an extra challenge: can you set up the lowest branch to fall down from above while bubbles are rising from below? (You will still need thumbtacks on the ends.)

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