X =	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15
Y =	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15
X ↔ Y

Ext-GCD(7, 9) :

i	GCD			Bezout				AOdd :						AEven :
	A	↔	B	ax	ay	bx	by	|A-B|	A↔B	Sx	Sy	ax ← Sx'	ay ← Sy'	A ← A/2	ax ← ax + Y	ay ← ay + X	ax ← ax/2	ay ← ay/2
0	7		9	1	0	0	1
1	7		9	1	0	0	1	2	1	1	1	1	1	1	10	8	5	4
2	1	↔	7	5	4	1	0	6	1	6	4	6	4	3	Even	Even	3	2
3	3		1	3	2	5	4	2	0	8	6	8	6	1	Even	Even	4	3
4	1		1	4	3	5	4	0
5	1		1	4	3	5	4	0
6	1		1	4	3	5	4	0
7	1		1	4	3	5	4	0
(4)(7) - (3)(9) = 1