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Answer the following question:
  
Name the technique to separate
(i). butter from curd,
(ii). salt from sea-water,
(iii). camphor from salt.

(i). The separation can be done by carrying in a centrifugal machine.

(ii). The separation can be done either by crystallisation or by .

(iii). The process of helps in separating camphor from salt. Camphor undergoes sublimation.