Hello! So the form requires 3 samples and only two of them can be an excerpt/small section from a larger piece.
Each piece, whether it's an excerpt or not, must be between 1.5k and 3k words.
For example ; one submission can be 1.5k words, another can be 3k words, and the third can be 2.2k words.
You can also link a portfolio that holds multiple other pieces with varying word counts.

Hopefully this answers your question!