TASK DEFINITION: Given a text, write a compressed version of it in a single sentence.
PROBLEM: "I could find no useful index: though there is a list of file names, they are numerical and offer no clue as to their contents."

SOLUTION: "I could find no useful index: though there is a list of file names."

PROBLEM: Guaranteed Results - The Acid Rain program enjoys nearly 100 percent compliance and only takes 75 EPA employees to run - a track record no command-and-control program can meet. Reductions in the early years averaged 25 percent below the required cap.

SOLUTION: Guaranteed Results-The Acid Rain program enjoys nearly 100 percent compliance with only 75 employees--a track record no program can meet. Reductions in the early years averaged 25 percent.

PROBLEM: "Many names point to the appearance, customs, staple diet, occupation, possessions or stamping ground of a tribe, as in the following:"

SOLUTION:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Names point to the appearance, customs, staple diet, occupation,etc. as in the following

