2350
Before then , only workers defined as such under the Labour Ordinance 1955 and those defined as industrial clerks under the Clerks Employment Ordinance 1957 were given paid holidays .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None