  In this paper we introduce a notion of front S^m-spinning for Legendrian
submanifolds of R^{2n+1}. It generalizes the notion of front S^1-spinning which
was invented by Ekholm, Etnyre and Sullivan. We use it to prove that there are
infinitely many pairs of exact Lagrangian cobordant and not pairwise Legendrian
isotopic Legendrian S^1 x S^{i_1} x ... x S^{i_k} in the standard contact
Euclidean space which have the same classical invariants if one of i_j's is
odd.
