We consider multiple entanglement swappings performed on a chain of bipartite
states. Each state does not violate CHSH inequality. We show that before some
critical number of entanglement swappings is achieved the output state does not
violate this inequality either. However, if this number is achieved then for
some results of Bell measurements obtained in the protocol of entanglement
swapping the output state violates CHSH inequality. Moreover, we show that for
different states we have different critical numbers for which CHSH inequality
is activated.Comment: 4 page