a = <span class="hljs-number">'hff</span>;
A = <span class="hljs-number">'HFF</span>;
b = <span class="hljs-number">8'h33</span>;
B = <span class="hljs-number">8'H33</span>;
c = <span class="hljs-number">12</span>;
d = <span class="hljs-number">'o755</span>;
e = <span class="hljs-number">8'b1001_0001</span>;
f = <span class="hljs-number">8'b1111zzzx</span>;
