# Topics

Rows are ordered based on estimated difficulty.

| lifetimes\[-adjacent\] | `trait`s           | `struct`s    |
|------------------------|--------------------|--------------|
| [explicit lifetimes]   | [`Fn`?]            | [`Duration`] |
| [extracting lifetimes] | [exclusive traits] | [`RcChars`]  |
| [composition]          | [merging traits]   | [`AnyStr`]   |


[explicit lifetimes]: ./exercises/refbind.md
[`Fn`?]: ./exercises/bind.md
[`RcChars`]: ./exercises/rcchars.md
[extracting lifetimes]: ./exercises/bool_stream.md
[exclusive traits]: ./exercises/multiple_blanket.md
[merging traits]: ./exercises/modes.md
[`AnyStr`]: ./exercises/anystr.md
[composition]: ./exercises/composition.md
[`Duration`]: ./exercises/duration.md