Whoever gives birth to crack babies increases future crime rates.
Some pregnant women use crack.
None but criminals increase future crime rates.
Pregnant crack users never give birth to anything but crack babies.
Some pregnant women are criminals.

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.