What is the best loop invariant for the loop in lines 2 - 4?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Using this pseudo code:

1 for i = 1 to A.length-1

2    for j = A.length downto i+1

3         if A[j]< A[j-1]

4              exchange A[j] with A[j-1]

What is the best loop invariant for the loop in lines 2 - 4?

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