# Tetrapent Oddities

## Introduction

An *oddity*
is a figure with binary symmetry formed by an odd number of copies of
a polyform.
Here are the minimal known oddities for tetrapents.
Please write if you find a smaller solution or solve the unsolved case.
See also Tetrapent Pair Oddities
and Pentapent Oddities.

### Impossible

### Unsolved

### Impossible

Each of these tetrapents has three cells pointing in the same direction.

### Impossible

### Unsolved

### Impossible

### Unsolved

*Last revised 2018-03-12.*

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Polyform Curiosities

Col. George Sicherman
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