Txns with 9 transactions, 16 items, and 36 non-zero elements
 Index │ Items
───────┼──────────────────────────────────────────────────
     1 │ milk, eggs, bread
     2 │ milk, eggs, butter, sugar, flour
     3 │ milk, eggs, bacon, beer
     4 │ bread, ham, turkey
     5 │ bread, ham, cheese, ketchup
     6 │ beer, cheese, mustard, hot dogs, buns, hamburger
     7 │ milk, eggs, sugar
     8 │ milk, beer, ketchup, hamburger
     9 │ eggs, bacon, ham, cheese
