mz    rx  xv    ex  nx    si   z=rowxm         oz 

  zx  co    a=  vn   w=   rs   ci     ne        wv 

   rmxr      ueau    ax  wi    mc     za        oc 

    nx        mw     xnwrv     xa     ez        ms 

    nx        xx     wo  rw    mu  xw o=  rz    ui 

    ex        cr     as   cu   uc    aa   os    z= 

    nu        ==     ux    ix   cx=xw nc   zsvmec