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