CONTRAPOSITIVE is validvalid

an immediate inference, which consists in denying the original subject of the contradictory of the original predicate

187,618 of 196,601 in NWL2023·also valid in CSW24

an immediate inference, which consists in denying the original subject of the contradictory of the original predicate

49,393 of 280,887 in CSW24·also valid in NWL2023

Cookie preferences

Choose which cookies this site can use. You can change this any time with Your Privacy Choices at the bottom of the page.

Strictly necessary (always on)

Needed for the site to work: remembering this choice and your word list, counting page views for this visit, and keeping the site safe.

Cookie details

Strictly necessary cookies
Name	Set by	Purpose	Kept for
sc-consent	Scrabble Word Checker	Remembers your cookie choice (stored in your browser)	12 months
wordlist, judge_lock	Scrabble Word Checker	Remembers your word list and Word Judge lock (stored in your browser)	Until cleared
sc_sid	Scrabble Word Checker	Counts page views for this visit only, no cookie (stored in your browser)	This visit
Security check	Vercel	Protects the site from bots and scrapers	This visit

Analytics

Google Analytics and our own counter see which pages and words are looked up and whether you have visited before, so we can see what helps. It does not tell us who you are, and advertising features are off.

Cookie details

Analytics cookies
Name	Set by	Purpose	Kept for
_ga	Google Analytics	Tells one visit from another	13 months
_ga_6E9WVZ79DS	Google Analytics	Keeps track of the current visit	13 months
sc_vid	Scrabble Word Checker	A random number so our own counter does not count a returning visitor twice (stored in your browser)	Until cleared