Consider the three individual elements $1,1$

and $2$

$.$ If we consider these elements as a single unordered collection of distinct objects then we call it the set $\{1,1,2\}$

$.$ Because sets are unordered, this is the same as $\{2,1,1\}$

$,$ and because we only collect distinct objects, this is also the same as $\{1,2\}$

$.$

For example, let A$=\{4,2,4,3\},$B$=\{3,4,3,3,2\}$

and C$=\{4,2,4,3,1,4\}$

$.$

a$)$

If every element of the set S

is also an element of the set T

$,$ then we say that S

is a subset of T

and write S$$T

$.$

Which of the above sets are subsets of one another?