Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Bobby Newman:  Okay , top five inventions of mankind : Um , the wheel , submarines , penicillin ...
Stephanie Layne: Slippers , creme brulee , spoons ...
Bobby Newman: Wait . But now we have six top - five inventions .
Stephanie Layne: Then let 's do ten ... and add _ four _ more .
Bobby Newman: Yes . I wanted to add dry - erase markers anyway .

inventions