Geodesic
The bicyclic semigroup has F4*.
Semigroup forum, Tome 47 (1993) no. 2, pp. 133-134

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Mots-clés : permutation property, bicyclic semigroup 
@article{SF_1993__47_2_135264,
     author = {C . Vachuska and P. Vachuska},
     title = {The bicyclic semigroup has {F4*.}},
     journal = {Semigroup forum},
     pages = {133--134},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1993},
     zbl = {0793.20055},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__47_2_135264/}
}
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C . Vachuska; P. Vachuska. The bicyclic semigroup has F4*.. Semigroup forum, Tome 47 (1993) no. 2, pp. 133-134. http://geodesic.mathdoc.fr/item/SF_1993__47_2_135264/