Write a program or function that takes in a positive integer N.

When N is 1, output

```
/\
\/

```

When N is 2, output

```
/\/\
\/ /
/ /
\/

```

When N is 3, output

```
/\/\/\
\/ / /
/ / /
\/ /
/ /
\/

```

When N is 4, output

```
/\/\/\/\
\/ / / /
/ / / /
\/ / /
/ / /
\/ /
/ /
\/

```

For larger N the pattern continues, a new layer is added every time N is incremented.

* "Output" means print the slash pattern or return it as a string.
* A single trailing newline in the output is allowed.
* Trailing spaces in the output are allowed but leading spaces are not.

**The shortest code in bytes wins.**