02_01_09.Rmd

---
title: "Exercise 2.1.9"
---

```{r include=FALSE} 
knitr::opts_chunk$set(options(scipen = 999))
knitr::opts_chunk$set(echo = FALSE)
```

> Enumerate all switching functions of 2 variables.

1. ```0000```
1. ```0001```
1. ```0010```
1. ```0011```
1. ```0100```
1. ```0101```
1. ```0110```
1. ```0111```
1. ```1000```
1. ```1001```
1. ```1010```
1. ```1011```
1. ```1100```
1. ```1101```
1. ```1110```
1. ```1111```