When {TAIL ~ the operating unit} is at {HEAD ~ an operating position}, it is closely attached to an input unit provided on the front surface of a mobile phone 
When { TAIL ~ the operating unit } is at { HEAD ~ an operating position } , it is closely attached to an input unit provided on the front surface of a mobile phone
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH