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, 4) :

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