Joints

Sketch and explain 2 good joints for the top shelf of a bookshelf.

Type of joint: Type of joint:

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Why is this a good way to join? Why is this a good way to join?
shelf

Sketch and explain 2 DIFFERENT good joints for a middle shelf on a bookshelf

Type of joint: Type of joint:

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Sketch:
Why is this a good way to join? Why is this a good way to join?