Disproof of LNC, feel free to criticize:
⊢S := S=false
⊢lnc := For all a, ¬(a^¬a)
⊢(S=false)=false
⊢S=true
⊢S=(true=false)
⊢S=false
⊢S^¬S
⊢¬lnc 

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