$$THETHA$$
$AE\left(HT\right)^{2}$
$$E^{1}T^{1}H^{1}A^{1}T^{1}H^{1}$$
$$E^{1}A^{1}T^{1}T^{1}H^{1}H^{1}$$
$$E^{1}A^{1}T^{1+1}H^{1+1}$$
$$E^{1}A^{1}T^{2}H^{1+1}$$
$$E^{1}A^{1}T^{2}H^{2}$$
$$AET^{2}H^{2}$$
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$A\left(HT\right)^{2}$
