$(1\mathrm{.}5$ pts$)$ S$1=\{-3,1,2,3\},$ S$2=\{2,3,4\}$ are two subsets of the universal set U $=\{$x $|-6<=$ x $<=6,$ x $$ Z$\}.$ Please fill in the blank. $(2$ pts$,0\mathrm{.}5$pt each$)$

S$1\_\_\_\_\_\_\_\_$ S$2=\{-3,1,4\}$

$|$S$1\text{'}|$ X $|$S$2|=\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

S$1-$ S$2=\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$