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7. Rectangle Validation (Easy)
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Problem Statement

Table: Rectangle
This table stores the dimensions of rectangles. Each row contains the lengths of four sides of a rectangle.

+---------------+------+
| Column Name   | Type |
+---------------+------+
| a             | int  |
| b             | int  |
| c             | int  |
| d             | int  |
+---------------+------+
(a, b, c, d) is the primary key for this table.
Each row of this table contains the lengths of four sides of a rectangle.

Determine for each set of four line segments whether they can form a rectangle

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