Recall that a q

$-$ary $($n$,$M$,2$t$+1)$

code satisfies

M$($k$=0$t$($nk$)($q$1)$k$)<=$qn

$($sphere$-$packing bound$).$ Give an example of a q

$-$ary $($n$,$M$,2$t$+1)$

code for which a sharper bound

M$($k$=0$t$+1($nk$)($q$1)$k$)<=$qn

doesn't hold.