Table:
text: Doctor Who (series 1)
Production blocks
Production blocks
Block Title Directed_by Written_by Code
1 Rose Aliens of London World War Three Keith Boak Russell T Davies 1.1 1.4 1.5
2 The End of the World The Unquiet Dead Euros Lyn Russell T Davies Mark Gatiss 1.2 1.3
3 Dalek Father`s Day Joe Ahearne Robert Shearman Paul Cornell 1.6 1.8
4 The Long Game Brian Grant Russell T Davies 1.7
5 The Empty Child The Doctor Dances James Hawes Steven Moffat 1.9 1.10
6 Boom Town Bad Wolf The Parting of the Ways Joe Ahearne Russell T Davies 1.11 1.12 1.13

Question: Which Written By has a code of 1.2 1.3 under Doctor Who (Series 1)?