Logic Gates: XNOR

The XNOR (= "not exclusive or") logic gate takes two bits as an input. Its output follows the rule: "if both bits are the same, output $1$; otherwise, output $0$." You can implement it in your code as follows: given the Boolean variables $x$ and $y$, the symbol: $!(x ^\wedge y)$ or $(x \oplus y)'$ means "$x$ xnor $y$". Below is the XNOR gate diagram and truth table.

Bonus question: How can we build an XOR gate if we know how to build NOT, AND, OR, XOR, NAND, and NOR gates?