Task: Sentence Expansion
Input (English): If its parents are each two inches taller than the averages for men and women , on average , the child will be shorter than its parents by some factor times two inches .
Output (English): If its parents are each two inches taller than the averages for men and women , then , on average , the offspring will be shorter than its parents by some factor ( which , today , we would call one minus the regression coefficient ) times two inches .