Section 7
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       # MATH introduce addition
[hear] (intro +);

[hear] (= 0110 / + 010 010);

[hear] (= 01110 / + 010 0110);

[hear] (= 010 / + 010 00);

[hear] (= 011110 / + 010 01110);

[hear] (= 011110 / + 011110 00);

[hear] (= 0110 / + 0110 00);

[hear] (= 011110 / + 00 011110);

[hear] (= 01110 / + 010 0110);

[hear] (= 0110 / + 00 0110);

[hear] (= 010 / + 00 010);