## Dunder Mifflin => 2nd previous value

```
123
877
_ + __
=> 1000
```

## HistoReplay
```
foo = 100
bar = 10
foo * bar
_ + 111
=> 1111
hist
foo = 1000
hist --replay 5..7
=> 10
=> 10000
=> 10111
```

## Amend-line (no bad pun)
```
squares = [1,10,100,100].map do |num|
  num * 2
  amend-line 2 num ** 2
end
```

## _in_ and _out_ Burger
```
_out_
_in_
```