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#11
05-31-2013, 07:55 PM
 shriekingviolet Junior Member Join Date: May 2013 Posts: 13

You've got that Della is the parrot. So from clue 8 Della is one month before the parakeet and from clue six, Bonita is one month before Upton

Della < parakeet
Bonita < Upton

Since Della and Bonita cannot be the same, neither can Upton and the parakeet.
#12
05-31-2013, 08:25 PM
 zenobia43 Senior Member Join Date: Mar 2012 Posts: 175

That's it!

By substituting Della for the parrot, you get the relations described by shriekingviolet, and a puzzle that looked like it needed the what-if treatment becomes routine pure logic.

After the substitution, you have two inequalities with entities in the same category on one side and the same distance from the entities on the other side.

As long as the entities on the other side are in different categories, you get another X - hopefully a new one.

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