Billy's book
===
[wk2](https://hackmd.io/@SuperBilly/B1BYbgqmT)
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[wk3](https://hackmd.io/@SuperBilly/B18OSl9ma)
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[wk4](https://hackmd.io/@SuperBilly/HJzgIe57T)
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[wk5](https://hackmd.io/@SuperBilly/HyDUwgqQa)
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[wk6](https://hackmd.io/@SuperBilly/HJi3Px5Qp)
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[wk7](https://hackmd.io/@SuperBilly/HkPj6o27T)
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[wk8](https://hackmd.io/@SuperBilly/rJCul2h7T)
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[wk9](https://hackmd.io/@SuperBilly/H1_xFpeXT)
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[wk10](https://hackmd.io/@SuperBilly/HkAWm3hXT)
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[wk11](https://hackmd.io/@SuperBilly/Sk7ttuD4T)
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[wk12](https://hackmd.io/@SuperBilly/HyZdT_7ST)
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[wk13](https://hackmd.io/@SuperBilly/BJfCWY2Sa)
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[wk14](https://hackmd.io/@SuperBilly/rksvuqE86)
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[wk15](https://hackmd.io/@SuperBilly/SyU3vQhLp)
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