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YES, you may apply and obtain a TRV without the job offer. However, the validity of your TRV would be short. z7 e; Z, m3 Y) r* F" o) ~! ^/ Q' r0 c' q4 X9 m) \0 @- R
For a longer term TRV, you should be gainfully employed./ Y2 o( }+ `& e5 M