The factors of (a2 - b2 - 4ac + 4c2) are

1
(a + 2c + b)(a - 2c - b)
2
(a - 2c + b)(a - 2c - b)
3
(a - 2b + c)(a + b + 2c)
4
(a - 2b)(a + 2b + 2c)

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