NOTE: Altough the code is original, this input.txt example is from the page 65 of the book System Software: An Introduction to Systems Programming, 3/e by Leland L. Beck. It's not mine and used here ...

For example, the two-level program structure may prove so useful in handling unwieldy arrays that it may be desirable to generalize it to n levels. The SYSTEM/~~O relocation technique described ...