$1!0Q!4W!0-!Pp!04!7o!BX!:`!7t'Xm (B/ s - $1!E*!RBs; $1!04!0S!BA!6as; $1!=G!04!TMs ($1!T+!4I!<D (B: s $1!E-!=H(B,s)
V.1, ($1!0&(B) -- V.2, ($1!0%(B).s