Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given an array of distinct integers arr, find all pairs of elements with the minimum absolute difference of any two elements.
Return a list of pairs in ascending order(with respect to pairs), each pair [a, b] follows

a, b are from arr
a < b
b - a equals to the minimum absolute difference of any two elements in arr

 
Please complete the following python code precisely:
```python
class Solution:
    def minimumAbsDifference(self, arr: List[int]) -> List[List[int]]:
```