Can you code this

I want to buy when a 21EMA crossover happens but only if RSI is under 30. Similarly I want to sell only if 21EMA crossover happens, but if RSI is over 70.


Buy Expression:    

SET MA1 = RSI(Close,14) < 30
SET MA2 = CROSSOVER(EMA(CLOSE, 21), CLOSE)
CROSSOVER(MA1, MA2) = TRUE

 Sell Expression: 

SET MA1 = RSI(Close,14)  > 70
SET MA2 = CROSSOVER(EMA(CLOSE, 21), CLOSE)
CROSSOVER(MA1, MA2) = TRUE
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