find_internal_conversion
find_internal_conversion(internals, targets, triangles_and_dihedrons=None, canonicalize=True, allow_completion=True, return_conversions=False, prep_conversions=True, include_shapes=False, cache=None, missing_val='raise'):
find_internal_conversion(internals, targets, triangles_and_dihedrons=None, canonicalize=True, allow_completion=True, return_conversions=False, prep_conversions=True, include_shapes=False, cache=None, missing_val='raise'):