2 Commits (8cdaae0935176a10761a53e281a22a957c6958d1)

Author	SHA1	Message	Date
Heng Li	3544c60c71	allow to test if index is present	2017-09-16 20:09:17 -04:00
Heng Li	10bd4079d1	fixed a bug on rev strand; added example	2017-09-16 17:51:13 -04:00