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As a result , when Ca does decay , it does so by double beta decay to Ti instead , being the lightest nuclide known to undergo double beta decay .
 location: Ca; location: Ti
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: Ca, Ti 
Answer:
 location: Ca; location: Ti