---
id: 5d79253685fc69b8fe60a0d2
title: Step 72
challengeType: 0
dashedName: step-72
---
# --description--
Chain the `map` method to `rangeFromString(n1, n2)` and pass it `addChars(c1)(c2)` as an argument.
This returns an `addChars` function, which has `c1` and `c2` (the characters) preset, and only needs a number (`n`) to be passed to it (which we get from the `rangeFromString` array).
# --hints--
See description above for instructions.
```js
assert(
code
.replace(/\s/g, '')
.includes(
'constvarRangeExpanded=x.replace(rangeRegex,(match,c1,n1,c2,n2)=>rangeFromString(n1,n2).map(addChars(c1)(c2)))'
)
);
```
# --seed--
## --before-user-code--
```html
Spreadsheet
```
## --after-user-code--
```html
```
## --seed-contents--
```html
```
# --solutions--
```html
```