2.1
wnds:Windows 20005.0
FchF
C1083107154487D1083107235405
newFormat
{p=proof{p{s(i{r&1;})r{u=uProof;s=proof;}o{c=0;s="";l="";d@}u{t()}f(t{s(i{r=fol{t="/x Cube(x) $ @x(Medium(x) $ ~BackOf(x, c))";b&8;g=@;}})r{u=uPremise;s=step;}o&6;u{t&8;}},t{s(i{r=fol{t="/x(~@y Tet(y) $ Cube(x))";b&8;g=@;}})r&14;o&6;u{t&8;}},t{s(i{r=fol{t="";b&8;g=@;}})r{u="uRule?";s=step;}o&6;u{t&8;}},t{s(i{r=fol{t="~Tet(c) $ @x(Medium(x) | BackOf(x, c))";b&8;g=@;}})r{u="uLog Con";s=fol;}o=fol_con{c=-1;s="";l="";d@f=48;}u{t(p{si&12;ss=0;},p{si&18;ss=1;})}},t{s(i{r=fol{t="";b&8;g=@;}})r&25;o&6;u{t&8;}},t{s(i{r=fol{t="****      This argument isn't valid      ****";b&8;g=@;}})r&25;o&6;u{t&8;}})}g{g&8;}a=true;}}c=55390;