--- head.p6 ---------------------------------------------
print*(=<>)[0..9]
--- tail.p6 ---------------------------------------------
my@l= =<>;
print@l[(@l>9??@l-10::0)...]
--- rev.p6  ---------------------------------------------
print reverse=<>
--- mid.p6  ---------------------------------------------
my@l= =<>;
print@l[int((@l-1)/2)..int(@l/2)]
--- wc.p6   ---------------------------------------------
say*(split"",int(7e10+ +*(=<>)))[1..11]