Assume the following code:

Comparator $$ String $>$ comparator $=$ new Comparator $$ String $>()\{$ public int compare$($String a$,$ String b$)\{$ return a$.$length$()-$b$.$length$()$; $\}$

$\}$;

PriorityQueue$=$String$>$queue$=$new PriorityQueue$(10,$comparator$)$;

queue.offer$("$abcdef$")$;

queue.offer$("$abcd$")$;

queue.offer$("$abcdefghi$")$;

queue.offer$("$a$")$;

queue.offer$("$abcdefghijklmn$")$;

what is the order of elements in queue?