$(1$ point$)$ Q$1.$ What is the output of the following $C$ program?

include sstilo,hs

ainclude sunistd,hs

ainclude dup$2(f,1)e_{\text{:}}t$

dup$2(f,1)$;

printf$("ilello$ world,$n")$;

return $e_{\text{:}}$

$t$

$a$