There are currently 4 special flavor bars with 6 flavors each. The dark vials are only provided with numbers, so that you don´t see which color direction awaits you.
Special sets of 6 flavors:
Off-flavors in beer:
Set S1: green apple, black currant, corn, cheese, butter, fish.
(Fish is welcome to be substituted with any other flavor you like).
Beer style aroma lists:
Set S2: classics: butter, honey, hops, banana, caramel, lemon.
Set S3: hoppy beers: passion fruit, pineapple, tangerine, lime, lychee, melon
Set S4: malty beers: caramel, butter cookie, hazelnut, coffee, dark chocolate, licorice
Likewise, there are large aroma bars with 12 different flavors. In total, there are 72 different flavors in the 6 large sets.