Deputy Lewis said there were two types of ash, the safer kind that is put in pits and the kind that normally goes up the chimney.

BBC: La Collette incinerator

There are two types of regular mammograms: the traditional analog kind and newer "digital" mammograms.

WSJ: Dense Breasts Pose a Dilemma in the Search for Breast Cancer

Today, there are two main types of hackers, and only one is causing this kind of trouble.

NEWYORKER: Machine Politics

There are two types of flash memory--the type that goes into cell phones and the other kind that goes into digital cameras.

FORBES: Magazine Article