Section 8
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       # MATH introduce subtraction
[hear] (intro -);

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

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

[hear] (= 0110 / - 011110 0110);

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

[hear] (= 011110 / - 0111110 010);

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

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

[hear] (= 011110 / - 0111111110 011110);

[hear] (= 011110 / - 011111110 01110);

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