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# Ruby, 74 bytes

Full program:

```
s=gets+$_.reverse
puts [s[0]]+s[1..-2].chars.zip(0..).map{_1+' '*_2+_1}<<s
```

Note that this is not fit for interactive use because it looks weird when you input trailing newlines. In bash, try `echo -n Hello | ruby wordsetsquare.rb`

## 75 bytes, Proc

```
->n{n+=n.reverse;([n[0]]+n[1..-2].chars.zip(0..).map{_1+' '*_2+_1}<<n)*'
'}
```