Create a method that prints a number pattern with the specified number of rows. Each row should contain numbers from 1 up to the row number.
Examples:
Input: rows = 4
Output:
"1
1 2
1 2 3
1 2 3 4"
Explanation: 4 rows with increasing numbers in each row
Input: rows = 2
Output:
"1
1 2"
Explanation: 2 rows with increasing numbers in each row
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