Apply Toivonen$$s Algorithm to the data of Exercise $6\mathrm{.}3\mathrm{.}1,$

with a support threshold of $4.$ Take as the sample the first row of baskets:

$\{1,2,3\},\{2,3,4\},\{3,4,5\},$ and $\{4,5,6\},$ i$.$e$.,$ one$-$third of the file. Our scaled$-$

down support theshold will be $1.$

$($a$)$ What are the itemsets frequent$$in$$the$$sample$?$