ABCs and Simplex

ABCs noun - The elementary stages of any subject (usually plural).

Simplex and ABCs are semantically related in simple topic. In some cases you can use "Simplex" instead an adjective "ABCs", when it comes to topics like elementary.

Simplex adjective - Having only one part or element.

ABCs and simplex are semantically related in simple topic. Sometimes you can use "ABCs" instead an adjective "Simplex", if it concerns topics such as elementary.