Hi,

Im starting to use cadabra 2x (I have alredy used cadabra 1x several times). I have a simple question. How can I call back an expression that I defined previously? for example:

```
{m,n,p,q,r}::Indices(position=free);
\nabla{#}::Derivative;
\partial{#}::PartialDerivative;
A_{m n}::AntiSymmetric;
V_{m}::Depends(\partial{#});
ex:=\partial_{m}{V_{n} A_{m}} + \partial_{m}{A_{n m}}:
unwrap(_);
```

gives as output: `A_{m}\partial_{m}{ V_{n} }`

. But if in a next line I want to define

`ex2:=@(ex); `

then, it doesnt return the original "ex" but the last output: `A_{m}\partial_{m}{ V_{n} }`

. Im used to the old `ex2:=@[ex]`

or `ex2:=@(%)`

. This last one saves the last output into a new expression, which I dont know how to do it neither.

Thank you!

ps: it seems that `\partial_{m}{ V_{n} }, \partial_{m}{V_{n}}, \partial_{m}( V_{n} )`

or `\partial_{m}(V_{n})`

work in the same way. Is this correct ? (note the difference in changing spaces and brackets).