Abstract Data Types - C programming

I'm in a C programming class trying to figure out the difference between a first-class ADT and a simple ADT.  help me :(

http://en.wikipedia.org/wiki/Abstract_data_type

First class ADT supports multiple instances.

>>1
Use GADTs.

I USE BINARY TREES ALL THE TIME

>>3
Use haskell

Use a warm fork

Don't call me gay, but I need some mary jay!

Marijuana MUST be legalized.

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