Question: how do I integrate HeunB function with complex argument which is multiplied by other functions. so i would like to carry out the integral over four independent variables. over fou

I am trying to calculate the following integra   

here g1 is a kummerM functin in s, and also h1 is another kummerM function  in ss, and f1 and fh1 are the HeunB functions with complex arguments in r and rr. and t=sqrt((r-rr)^2+(s-ss)^2).I would like to integte over dr drr ds dss

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