# Tetrapent Pair Oddities

## Introduction

An *oddity*
is a figure with binary symmetry formed by an odd number of copies of
a polyform.
Oddities can also be constructed from two different shapes.
Here are the minimal known oddities for pairs of tetrapents,
using at least one copy of each tetrapent.
Please write if you find a smaller solution or solve an unsolved case.

See also Tetrapent Oddities
and Tetrapent Triplet Oddities.

### Impossible

### Unsolved

### Impossible

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

### Impossible

### Unsolved

### Impossible

### Unsolved

*Last revised 2023-11-06.*

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Polyform Curiosities

Col. George Sicherman
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