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Logical Argument and Proof Theory. Includes Logical Consequence, Proposition, Premises, Truth, Invalid, Conclusion, Deductive Arguments, Declarative and ...
asserts  corresponding conditional  logical consequence 
www.proves.org - 2009-04-10
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Portal dedicat instrumentelor de validare. Vrei sa stii daca un numar de telefon, daca un cod postal, national sau international, este valid? Ai un website, o ...
adrese de email  validare rss  validare xhtml  validare xml 
www.validator.ro - 2009-04-07
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Invalid - definitions and discussions of invalid aspects
www.invalid.com - 2009-02-05
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