{"in": ["mineral oil"], "out": ""}
{"in": [], "out": ""}
{"in": ["HPLC grade water"], "out": ""}
{"in": [], "out": ""}
{"in": [], "out": "mineral oil"}
{"in": ["mineral oil"], "out": ""}
{"in": [], "out": "air bubbles"}
{"in": [], "out": ""}
{"in": [], "out": ""}
{"in": [], "out": "the current limit"}