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I joined at fourth rak’ah with imam at ‘Asr prayer and considered it as my fourth rak’ah as well. Then I followed the imam till salam and after his salam, I stood up and firstly prayed the two rak’ahs as I pray usually then I sat for tashahud and finally prayed my third rak’ah, then I sat again and concluded my prayer after tashahud, darud etc and salaam. Is my prayer ok?