These are answered already, from plato. : )
use the venn diagram to map the characteristics of mark twain and ambrose bierce.

mark twain:
created main characters of all ages.
incorporated romantic traits in his characters to create a contrast with realist character.

both: known for writing with wit and humor

bierce:
started writing after the civil war
greatly influenced by the civil war
had an idealistic outlook on life prior the civil war