human
Solve the following python programming problem given the following code:
def concat_opts(opts) : 
    def cat(x, y) : 
        (px, ex) = x 
        (py, ey) = y 
        v = (ex if px else { 
            
}).copy () 
        v.update ((ey if py else { 
            
}).copy ()) 
        return ((px or py), v) 
return reduce (cat, cat, (True, { 
        
})) [1] 

    
    

    Fix the buggy line: return reduce (cat, cat, (True, {
assistant
#Here is Python program to fix the buggy line: return reduce (cat, cat, (True, {
.

return reduce (cat, opts, (True, {