a(1)-5=-4→22=v j(10)-5=5=e l(12)-5=7=g y(25)-5=20=t → vegt
t(20)-5=15=o k(11)-5=6=f w(23)-5=18=r n(14)-5=9=i → ofri tkwn-dmwak-mn-ajly
Try backward: t(20) → r(18), k(11) → i(9), w(23) → u(21), n(14) → l(12) → riul — no. k(11) → i(9)