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(9, 7) :

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	9		7	1	0	0	1
1	9		7	1	0	0	1	2	0	1	1	1	1	1	8	10	4	5
2	1		7	4	5	0	1	6	1	4	6	4	6	3	Even	Even	2	3
3	3	↔	1	2	3	4	5	2	0	6	8	6	8	1	Even	Even	3	4
4	1	↔	1	3	4	4	5	0
5	1	↔	1	3	4	4	5	0
6	1	↔	1	3	4	4	5	0
7	1		1	4	5	3	4	0
(4)(9) - (5)(7) = 1