The Universal Capability of NAND and NOR Gates

NAND and NOR gates are universal logic gates.
The AND, Or, Nor and Inverter functions can all be performed using only NAND gates.
The AND, OR, NAND and Inverter functions can all be performed using only NOR gates.
An inverter can be made from a NAND or a NOR by connecting all inputs of the gate together.
If the output of a NAND gate is inverted, it becomes an AND function.
If the output of a NOR gate is inverted, it becomes an OR function.
If the inputs to a NAND gate are inverted, the gate becomes an OR function.
If the inputs to a NOR gate are inverted, the gate becomes an AND function.
When NAND gates are used to make the OR function and the output is inverted, the function becomes NOR.
When NOR gates are used to jake the AND function and the output is inverted, the function becomes NAND.