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Subtraction of Imperial unit

510' 11 "4 + 27' 4" 3 (Five hundred ten feet, eleven inch four dori + twenty seven feet four inch three dori)Key sequence:- 510 [foot] 11 [Inch] 4 [dori] [+] 27 [foot] 4 [Inch] 3 [Dori] [=]

Key Operations Display
Key Operation 88888888' 88"8
510 8888888 5' 10"8
[foot] 88888510' 88" 8
11 888885 10' 1 1"8
[Inch] 888885 10' 1 1"8
4 888885 10' 1 1"4
Key Operation 888885 10' 1 1"4                              (Not necessary to press dori Button as third parameter will be treated as dori by default )
[-] 888885 10' 1 1"4
27 88888888' 27" 8
[Foot] 88888827' 88"8
4 88888827' 84" 8
[Inch] 88888827' 84" 8
3 88888827' 84"3
Key Operation 88888827' 84" 3                              (Not necessary to press dori Button as third parameter will be treated as dori by default )
Answer- 88888483' 87"1