All unripe fruit is unwholesome.
All these apples are wholesome.
No fruit grown in the shade is ripe.
These apples were grown in the sun.

The following sorites are taken from Lewis Carroll’s Symbolic Logic. All 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.