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(3, 15) :

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	3		15	1	0	0	1
1	3		15	1	0	0	1	12	1	1	1	1	1	6	16	4	8	2
2	6	↔	3	8	2	1	0	3						3	Even	Even	4	1
3	3	↔	3	4	1	1	0	0
4	3	↔	3	4	1	1	0	0
5	3	↔	3	4	1	1	0	0
6	3	↔	3	4	1	1	0	0
7	3		3	1	0	4	1	0
(1)(3) - (0)(15) = 3