To play seven black counter are added four times .
Interestingly if you rotate the board would be the result of playing .
The hands and produce the same result. So it is that four Sevens and seven Fours produce the same number.
Rotating the board never changes how many counters there are on the board.
When wildholders are added to the game then and produce the same result.
For numbers we write 4 x 7 for four Sevens, but in wildcards we write 4x or xy since an x in 4 x x or x x y may be confused with a wildcard or wildholder symbol.
In recording 4 x 7 = 7 x 4 and xy = yx
In maths this is known as the commutative law of multiplication.