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1
Building your own path
The builder shows every lesson of the catalogue flat, grouped by theme, to build a path your own way rather than follow the book order.
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2
Filtering
The two lists at the top filter by theme, then by level; both filters combine. Clearing a filter brings the whole list back.
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3
Reading a lesson
A tap opens the lesson, the same one as in book mode: progress and scores are shared between both modes.
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4
Locked lessons
A locked lesson belongs to a chapter that is not unlocked: its chapter is bought individually from the shop or opens with Premium.
