-- eg, find people with a given first name:
-- learn some people:
first-name |Fred Smith> => |Fred>
last-name |Fred Roberts> => |Roberts>
middle-name |Sam J. Gleeson> => |Jack>
age |Sam O'Conner> => |age: 47>
mother |Sam Tompson> => |Liz Tompson>
-- now find all kets that starts-with |Fred >
starts-with |Fred >
|Fred Smith> + |Fred Roberts>
-- now find all kets that starts-with |Sam >
starts-with |Sam >
|Sam J. Gleeson> + |Sam O'Conner> + |Sam Tompson>