$$2^{2}(+3)H$$
$12H$
$$4\times 3H$$
$$12H$$
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$12$
$$\frac{\mathrm{d}}{\mathrm{d}H}(4\times 3H)$$
$$\frac{\mathrm{d}}{\mathrm{d}H}(12H)$$
$$12H^{1-1}$$
$$12H^{0}$$
$$12\times 1$$
$$12$$
