Some possible answers might include:
- a pattern in a line can still be a repeating pattern but there's only one pattern
 - the order remains the same in a line pattern and on a grid
 - on a grid, more patterns begin to develop (e.g. the shapes repeat diagonally or in the columns)
 
Pictured below is a sample of a level four (4/4 score) provided by one student (click on the photo to make it bigger). 

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