completed about_methods
completed about_keyword_arguments
completed about_constants
completed about_control_statements
completed about_true_and_false
completed triangle_project
completed about_exceptions
completed triangle project 2
completed about_iteration
completed about_blocks
completed about_sandwich_code
completed scoring_project
completed about_classes
completed about_open_classes
completed dice_project
completed about_inheritance
completed about_modules
completed about_scope
completed about_class_methods
completed about_message_passing