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This seems odd. When I try to look up a list element which has a space in the name using just the first word (i.e. no spaces), it will sometimes return the element with a space in the name and sometimes it will return NULL. Try this: alist <- list( 'hello'=10, bye=20, 'hello world'=30, 'goodbye world'=40, 'hi world'=50, 'goodbye foo'=60, 'goodbye