{"subshape": {"value": "arrow", "label": "arrow"}, "shape": {"value": "cospan", "label": "cospan"}}
{"subshape": {"value": "arrow", "label": "arrow"}, "shape": {"value": "endomorphism", "label": "endomorphism"}}
{"subshape": {"value": "arrow", "label": "arrow"}, "shape": {"value": "pair of parallel arrows", "label": "pair of parallel arrows"}}
{"subshape": {"value": "arrow", "label": "arrow"}, "shape": {"value": "span", "label": "span"}}
{"subshape": {"value": "arrow", "label": "arrow"}, "shape": {"value": "tower", "label": "tower"}}