Please answer a question about the following table 

header: Route Number | Route | Via | Operator | Operation row 1 : 25 | Ilford Hainault Street to Oxford Circus | Holborn , Aldgate ,  | First London | 24 Hours. London Buses service.
row 2 : 66 | Leytonstone Station  to Romford Station | Wanstead , Redbridge , G | Arriva London | Daily. London Buses service. Times
row 3 : 86 | Stratford Bus Station to Romford Station | Manor Park, Ilford , Seven Kings | Stagecoach London | Daily. London Buses service. Times
row 4 : 101 | Wanstead Station to Gallions Reach Shopping Centre | Manor Park , East Ham , Beck | Stagecoach London | Daily. London Buses service. Times
row 5 : 123 | Ilford Hainault Street to Wood Green Bus | Gants Hill , Walthamstow | Arriva London | Daily. London Buses service. Times
row 6 : 128 | Claybury Broadway to Romford Station | Barkingside, Gants Hill , Il | Arriva London | 24 Hours. London Buses service.
row 7 : 145 | Leytonstone to Dagenham Asda | Redbridge , Ilford, Becontre | Stagecoach London | Daily. London Buses service. Times
row 8 : 147 | Ilford Hainault Street to Canning Town | East Ham , Newham General Hospital, Custom | Stagecoach London | Daily. London Buses service. Times
row 9 : 150 | Chigwell Row to Becontree Heat | Hainault Barkingside, Gants Hill | Arriva London | Daily. London Buses service. Times
row 10 : 167 | Debden  to Ilford Hainault Street | Loughton , Barkingside, | Blue Triangle | Daily. London Buses service. Times
row 11 : 169 | Barking Town Centre to Clayhall The Glade | Ilford , Newbury Park, Barking | Stagecoach London | Daily. London Buses service. Times
row 12 : 179 | Chingford to Ilford Hainault Street | Woodford Green, South Woodford , G | First London | Daily. London Buses service. Times
row 13 : 247 | Barkingside Station  to Romford Station | Hainault , Collier Row | Stagecoach London | Daily. London Buses service. Times
row 14 : 275 | Walthamstow St James Street Station to | Highams Park, Woodford Green, Wood | Arriva London | Daily. London Buses service. Times
row 15 : 296 | Ilford Sainbury's to Romford | Gants Hill , Newbury Park, Rose | Stagecoach London | Daily. London Buses service. Times
row 16 : 308 | Wanstead Station to Clapton Park Millfield | Forest Gate , Stratford , Le | First London | Daily. London Buses service. Times
row 17 : 362 | Grange Hill  to King George Hospital | Hainault, Marks Gate, Chad | Blue Triangle | Daily. London Buses service. Times
row 18 : 364 | Ilford Hainault Street to Dagenham | Goodmayes , Becontree | Blue Triangle | Daily. London Buses service. Times
row 19 : 366 | Redbridge Falmouth Gardens to Beckton Station | Redbridge , Ilford, Barking | Stagecoach London | Daily. London Buses service. Times
row 20 : 396 | Ilford Sainbury's to King George | Gants Hill , Newbury Park, Little | Stagecoach London | Daily. London Buses service. Times
row 21 : 462 | Hainault The Lowe to Ilford Ha | Grange Hill , Barkingside, G | Arriva London | Daily. London Buses service. Times
row 22 : EL1 | Ilford Station  to Barking Reach | Ilford Lane, Barking , River Road | Blue Triangle | 24 Hours. London Buses service.
row 23 : EL2 | Ilford Station  to Dagenham Dock Station | Barking , Thames View Estate, Dagen | Blue Triangle | Daily. London Buses service. Times
row 24 : W12 | Walthamstow Coppermill Lane to Wa | Walthamstow Central , Whipp | HCT Group | Daily. London Buses service. Times
row 25 : W13 | Woodford Wells to Leytonstone Station | Woodford Green, Snaresbrook  | HCT Group | Daily. London Buses service. Times
row 26 : W14 | Leyton Asda to Woodford Bridge | South Woodford , Wanstead , | Arriva London | Daily. London Buses service. Times
row 27 : W19 | Walthamstow Angel Avenue to Ilford | Walthamstow Central , Leyton | Blue Triangle | Daily. London Buses service. Times

what are all the route numbers? which is listed before the woodford wells to leytonstone station route?

Answer: W12