Function Cudd_BiasedUnderApprox 

pub unsafe extern "C" fn Cudd_BiasedUnderApprox(
    dd: *mut DdManager,
    f: *mut DdNode,
    b: *mut DdNode,
    numVars: c_int,
    threshold: c_int,
    quality1: f64,
    quality0: f64,
) -> *mut DdNode