Free semigroup with involution

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Free, Free will, Free Negro, Free improvisation, Free education, Free church, Free will in theology, Free trade, Free license, Free throw, Free convolution, Duty-free shop, Free software, Free climbing, Car-free days, Free Will Baptist, Free module, Free as in Freedom, Free Free, Free festival, Free trade area, Free monoid, Free product, Caffeine-Free Coca-Cola, Free!, Free market, Context-free language, Free party, Free agent, Free reed aerophone, Free ride, Free state, Free clinic, Free software movement, Free-culture movement, FSF Free Software Awards, Home Free, Free newspaper, Outline of free software, Free jazz, Free Press, Free Spirit, Free content, Free Software, Free Society, Free Software Foundation, Free love, Free standard, Free solo climbing, Free-to-play, Free Soil Party, Free form, Gluten-free diet, Free lattice, Free at Last (Free album), Detroit Free Press, Free-software license, Royal Free Hospital, Nuclear-free zone, Free State Division, Free group, Thermodynamic free energy, Free Java implementations, Free music, Free Stater, Coordinate-free, Free state (polity), Gluten-free, casein-free diet, Risk-free rate, Free Software Magazine, The Free Dictionary, Free association, Free File, Free flap, Free imperial city, Free World, Free-to-air, Students for Free Culture, Free State (province), Definition of Free Cultural Works, Free-trade zone, Free base, Free territory, Land of the Free, Square-free integer, Free range, Free verse, Free-market roads, Free and open-source software, Free Radical Research, Free fall, Free people of color, Get Free, Free State Provincial Legislature, Free Democrats, Free zone, The Free Software Definition, Free trade areas in Europe, Caffeine-Free Pepsi, Midpeninsula Free University, Toll-free telephone number, Free Women, Free Men, Free fall (disambiguation), Free France, Free school, Free school (England), Free Fire (video game), Free-radical theory of aging, Free Flight, Free refill, Free-Will, Gibbs free energy, For Free, Germ-free animal, Scale-free network, Royal free city, Free (ISP), Free Will (disambiguation), Free Press (publisher), Free abelian group, Free trade agreement, The Free Lance–Star, Illusionism (free will), Free Hill, Tennessee, Scott Free, Free tenant, Free-Stater (Kansas), Specific-pathogen-free, Free streaming, Free-produce movement, Free Quakers, Free silver, Free object, Free Church of Scotland (since 1900), Free-market environmentalism, Free Cossacks, Ronnie Free, Little Free Library, Free-range eggs, Free Culture, World B. Free, Free Methodist Church, Free-machining steel, For Free? (Interlude), Oxygen-free copper, Free grace theology, Evangelical Free Church of America, Free algebra, Canada–European Free Trade Association Free Trade Agreement, Free Country, Free Studio, No such thing as a free lunch