Modules
		cctbx.development.debug_utils cctbx.array_family.flex math mmtbx pickle random cctbx.development.random_structure cctbx.sgtbx sys

Functions
		StringIO(...) StringIO([s]) -- Return a StringIO-like stream for reading or writing exercise_1() exercise_2() exercise_3() run() test_1(xray_structure)