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Regles deductives<br />
Modus tollens<br />
(MT)<br />
Si plou, la riera es<br />
desbordarà<br />
La riera no s´ha<br />
desbordat<br />
No ha plogut<br />
A = plou<br />
B = la riera es<br />
desbordarà<br />
Si A, aleshores B<br />
No B<br />
Per tant, no A
![La essa sorda [s, ss, c, ç] i la essa sonora [z, s]](https://img.yumpu.com/16488790/1/184x260/la-essa-sorda-s-ss-c-c-i-la-essa-sonora-z-s.jpg?quality=85)
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