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(11, 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	11		7	1	0	0	1
1	11		7	1	0	0	1	4	0	1	1	1	1	2	8	12	4	6
2	2		7	4	6	0	1	5						1	Even	Even	2	3
3	1		7	2	3	0	1	6	1	2	4	2	4	3	Even	Even	1	2
4	3	↔	1	1	2	2	3	2	0	3	5	3	5	1	10	16	5	8
5	1	↔	1	5	8	2	3	0
6	1	↔	1	5	8	2	3	0
7	1		1	2	3	5	8	0
(2)(11) - (3)(7) = 1