Nothing that is brittle is ductile.
Superconductors are all ceramics.
Only ductile things can be pulled into wires.
Ceramics are brittle.
Superconductors cannot be pulled into wires.

The following sorites are valid. Rewrite each sorites in standard form, using letters to represent the terms and reducing the number of terms whenever necessary. Then use Venn diagrams or the rules method to prove each one valid.