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I under stand that a contract calling another contract will generate an internal transaction that is not recorded in the blockchain. This usually happens after CALL opcode.

I'm wondering if there are any other opcodes that can generate internal transactions? and if this is mentioned anywhere in the documentation

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According to this answer, Contract Transactions or Internal Transactions can be generated from the following opcodes: 

CREATE
CALL
CALLCODE
DELAGATECALL
SUICIDE

As well, there's more to it than just tracking the opcodes. See that answer for more details.

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