What is the sample space of the sum of two six sided dice where the first number is less than 4

The sample space of the sum of two six-sided dice where the first number is less than 4 can be represented as:

{(1,1), (1,2), (1,3),
(2,1), (2,2), (2,3),
(3,1), (3,2), (3,3)}

Each pair (x,y) represents the outcomes of rolling two dice, where the first number is x and the second number is y.

Write it like example 1 2 3 4 5 6

1 1, 1 2, 1 3,

2 1, 2 2, 2 3,
3 1, 3 2, 3 3.

That's wrong

Apologies for the mistake. Here is the correct representation of the sample space:

1 1, 1 2, 1 3, 1 4, 1 5, 1 6,
2 1, 2 2, 2 3, 2 4, 2 5, 2 6,
3 1, 3 2, 3 3.