Filter out empty llls

[gratkowski]

Hello, how do I filter out empty llls ?
i.e. [ [ ] [ ] [ 0 ] [ 0 ] [ 1 ] [ 0 ] 0 [ 0 ] [ 0 ] [ 0 ] [ 0 ] [ 0 ] [ 0 ] [ 0 ] [ 1 ] [ 0 ] [ 0 ] 0 ]
I would like to filter out all [] and the 0 but not [ 0 ] and [ 1 ]

[danieleghisi]

have a look at bach.sieve (with the @maxdepth attribute). Look at bach.mapelem as well, maybe!
Hope this helps,
Daniele