'How to encode initializer in gnosis-safe proxy contract?

currently i start learning gnosis-safe contracts i have a small doubt in gnosis-proxy contract how to encode initializer in createProxyWithNonce function.

Reference transaction id : https://rinkeby.etherscan.io/tx/0x1a06fa9fa2e420391ceb159ea41eeb595750ed0d88a14be2e154a7df959f46bc



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