\begin{array}{lllllllllllll}
 & \text{270} & \text{271} & \text{272} & \text{273} & \text{274} & \text{275} & \text{276} & \text{277} & \text{278} & \text{279} & \text{27A} & \text{27B} \\
\text{0} & @ & & & & & & @ & & & & & @ \\
\text{1} & & & & & & & & & & & & \\
\text{2} & & & & & & & & & & & & \\
\text{3} & & & & & & @ & & & & & & \\
\text{4} & & & & & & @ & & & & & & \\
\text{5} & @ & & & & & @ & & & & @ & & \\
\text{6} & & & & & & & & & & @ & & \\
\text{7} & & & & & & & & & & @ & & \\
\text{8} & & & @ & & & & & & & & & \\
\text{9} & & & & & & & & & & & & \\
\text{A} & @ & & & & & & & & & & & \\
\text{B} & @ & & & & & & & & & & & \\
\text{C} & & & & & @ & & & & & & & \\
\text{D} & & & & & & & & & & & & \\
\text{E} & & & & & @ & & & & & & & \\
\text{F} & & & & & & @ & & & & & & @ \\
\end{array}
