> pick an emoji to represent each concept
> * easy
> * medium
> * hard
> * short
> * long
>
> dont use faces
> dont use the arrows for lengths
> dont use the same emoji for two different things

[response lost, it suggested colored circles which was what I wanted for difficulty anyway]

> pick emoji to represent concept
> 
> short = 
> long = 

Short = ⏱️
Long = 🕰️