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The hyperfine structure splittings are determined for all five bound $S(L =0)-$states in the three symmetric muonic molecular ions: $pp\mu, dd\mu$ and$tt\mu$. The expectation values of all interparticle delta-functions used inour calculations have been determined in recent highly accurate computations.

Hyperfine structure splitting of the bound $S(L = 0)-$states in the symmetric muonic molecular ions