1.

{:("(i) Li-ion battery","(a) Pacemakers"),("(ii) Mercury button cell","(b) Fuel cell"),("(iii) Lead storage battery","(c ) Cell phone"),("(iv) "H_(2)-O_(2)" cell","(d) Inverter"):}

Answer»

`{:(A,B,C,D),(a,b,c,d):}`
`{:(A,B,C,D),(d,c,b,a):}`
`{:(A,B,C,D),(b,d,a,c):}`
`{:(A,B,C,D),(c,a,d,b):}`

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