[firedrake] How to convert tuple of C string expressions to UFL?

Hi, firedrake-bench/elasticity (from 'experiments' branch) uses C string expressions which are no longer supported. I read some tips for conversion here, however, the help doesn't cover the case where there is a tuple of C string expressions: https://www.firedrakeproject.org/interpolation.html#c-string-expressions How to convert this? f = Function(V) f.interpolate(Expression( ("cos(2*pi*x[0])*cos(2*pi*x[1])*cos(2*pi*x[2])", "cos(2*pi*x[0])*cos(2*pi*x[1])*cos(2*pi*x[2])", "cos(2*pi*x[0])*cos(2*pi*x[1])*cos(2*pi*x[2])"))) Please forgive if this is obvious, I have no knowledge in this domain at all, just trying to blindly run this code. Thank you.