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(10, 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	10		9	1	0	0	1
1	10		9	1	0	0	1	1						5	10	10	5	5
2	5		9	5	5	0	1	4	1	5	6	5	6	2	14	16	7	8
3	2	↔	5	7	8	5	5	3						1	16	18	8	9
4	1	↔	5	8	9	5	5	4	1	13	14	4	4	2	Even	Even	2	2
5	2		1	2	2	8	9	1						1	Even	Even	1	1
6	1		1	1	1	8	9	0
7	1		1	1	1	8	9	0
(1)(10) - (1)(9) = 1