158. Alphanumeric puzzle. This puzzle is not difficult to solve with the right approach:

$$
\begin{array}{llll}
A \times B=B, & B \times C=AC, & C \times D=BC, & D \times E=CH \\
E \times F=DK, & F \times H=CJ, & H \times J=KJ, & J \times K=E \\
& K \times L=L, & A \times L=L .
\end{array}
$$[^8]

Each letter represents its own digit, and of course, $AC, BC$, etc., are two-digit numbers. Can you determine which digit corresponds to each letter?
158. It is clear that \(A\) is 1, and \(B\) and \(C\) represent either 6 and 2, or 3 and 5. From the third equation, it is evident that they are 3 and 5, since \(D\) must equal 7. The letter \(E\) is 8, because in the product \(D \times E\) the value \(C=5\) appears. The rest is quite easy to complete, and we get the following answer:

\[
\begin{array}{lllll}
A=1, & B=3, & C=5, & D=7, & E=8, \\
F=9, & H=6, & J=4, & K=2, & L=0
\end{array}
\]