What is the difference between those two words "subsequentially" and "successively"?
If I wanna express a meaning of '" 'A', ''B', 'C' and 'D' are connected, and the order of their connection are 'A' is conncected with ''B', and ''B' is connectecd with 'C', and 'C' is connected 'D'/by the order of me saying ''A' 'B' 'C' and 'D' ", Should I say " 'A', ''B', 'C' and 'D' are connected subsequentially" or " 'A', ''B', 'C' and 'D' are connected successively"? Thank U so much for your help!!!

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subsequentially is wrong word, correct word is subsequently.

Subsequently means "happening after something else"
Example: He went to a museum, and subsequently we went to have launched.
Example: I met John and we discussed about business and subsequently his illness.

successively means "​happening one after the other without any ​break".
Example: They are successively winning third time.
Example: She successively shared great books on international politics.

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You should use successively.This means "in order". Subsequently means "just after", but is used when describing the order  which multiple events took place. For example, "The doorbell rang subsequently after I had put the cookies in the oven."