[R] apply union function vectorially

[statquant2]

Thank you very much, this solve the problem, but more generally is there a
function that allow to apply a function to a list of object, applying
recursively the function to each answer...

mathematically for a 2 argument function f(u,v) you would like a function g
doing 
g(u1,u2,u3,u4,u5) =f(f(f(f(u1,u2),u3),u4),u5)

Thanks if you can help
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