Just point out that the union of the sets would add in newbies while the intersection would but again was all in humour
I got your point. But the thing is, I don't expect many newbies (i.e. between two and four weeks of activity) to have [in ascending order of difficulty]:
a) a desire for merit immediately
b) high post quality
c) 20
high-quality posts
d) 20
consecutive high-quality posts