297224
Lock and block In 1874 Sykes approached James Staats Forbes with a scheme to interlock the signals and points of three three successive LCDR signal boxes in outer London .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None