Counting numbers are to be formed using only the digits 7, 8, and 9. Determine the number of different possibilities for the type of number described below. Four-digit numbers with one pair of adjacent 8s and no other repeated digits (Hint: You may want to split the task of designing such a number into three parts, such as (1) position the pair of 8s, (2) position the 7, and (3) position the 9.) The number of different possibilities for this type of number is (Type a whole number.)