$$BOBOKA$$
$AK\left(BO\right)^{2}$
$$K^{1}B^{1}O^{1}A^{1}B^{1}O^{1}$$
$$K^{1}A^{1}B^{1}B^{1}O^{1}O^{1}$$
$$K^{1}A^{1}B^{1+1}O^{1+1}$$
$$K^{1}A^{1}B^{2}O^{1+1}$$
$$K^{1}A^{1}B^{2}O^{2}$$
$$AKB^{2}O^{2}$$
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$A\left(BO\right)^{2}$
