Alphabet Group
Copyright ©2010 by Paul Niquette. All rights reserved.
are merely three letters selected from the English alphabet so deliciously exhibited on the right. All three uniquely belong in all the categories listed below.  You are invited to test your powers of observation by completing this table...
 
Letters in the English alphabet
26
Letters formed with straight lines
?
Letters formed without lifting pencil
?
Letters that take indefinite article "an"
?
Letters pronounced with an initial "eh"
?
Consonants
21
Consonants taking indefinite article "an"
?
Consonants pronounced with an initial "eh"
?
Consonants that are voiced
?
Triads available for license-plates
17,576
Triads with no repetitions
?
Triads in alphabetical order
?
Triads in consecutive alphabetical order
?
Triads that are abbreviations in real life
31

Bonus Puzzle 


Which category in the table can be used to characterize exactly 13 of the first 100 integers.


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