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kotlinlang

Trying the koans, is there a difference between the two lines??? 

```
    val whatisthis = customers.flatMap { it.orders }.flatMap { it.products }
    val allProducts = customers.flatMap { it.orders.flatMap { it.products } }    
```

Thanks in advance, I did compare and it says they are the same ```println(whatisthis == allProducts)```

The first one creates a temporary list with all of the orders first, and then maps that to a list of producs in order of the orders. The second one creates a bunch of temporary lists for each customer's list of products for their orders and combines those.