src/solver/__init__.py

from .set_finder import (
    Card, Shape, Color, Number, Fill,
    is_valid_set, find_all_sets, find_first_set,
    generate_all_cards, card_to_index, index_to_card
)

__all__ = [
    'Card', 'Shape', 'Color', 'Number', 'Fill',
    'is_valid_set', 'find_all_sets', 'find_first_set',
    'generate_all_cards', 'card_to_index', 'index_to_card'
]