1
template <template<class T> class X>
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template<class T,class S>
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template <template<class T> class X>
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template<template<class T1,class T2> class T>
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template<template<class T1,class T2> class T, class S>
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f(ab); // calls f(A<B>)
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l(z); // calls l(C<int,int>)