Q49. Convert this 2-mode data into 1-mode data

Flavor Who Likes It
Chocolate Abe, Bertha, Cyndra, Dalia
Vanilla Abe, Cyndra, Eve, Faisel, Gerd
Strawberry Bertha, Cyndra, Hettie, Iolantha
Pistachio Cyndra, Dalia, Gerd, Hettie, Iolantha