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Valentín Albillo Calculator Articles
Valentín Challenges:
#10: Counting Beans
#11: Who's Next ?
#12: Squaring Cubes
#13: Adding up to Infinity
#14: Cooking Conjectures
#15: Spring 2006 Special
#16: Thinking Square !
#17: The Feast
#18: 2007's Spring Special
#19: Surprise !
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