Original set of invitees:
Alan Perlis  Allen Newell  Amir Pnueli  Butler W. Lampson  C. Anthony R. Hoare  Charles W. Bachman  Dana Scott  Dennis Ritchie  Dick Karp  Donald E. Knuth  E.F. Codd  Edsger Wybe Dijkstra  Edward Feigenbaum  Fernando J. Corbato'  Herb Simon  Ivan Sutherland  J.H. Wilkinson  John Backus  John Cocke  John Hopcroft  John McCarthy  Juris Hartmanis  Ken Iverson  Ken Thompson  Manuel Blum  Marvin Minsky  Maurice Wilkes  Michael O. Rabin  Niklaus Wirth  Raj Reddy  Richard Hamming  Richard Stearns  Robert E. Tarjan  Robert W. Floyd  Robin Milner  Stephen Cook  William (Velvel) Kahan  

Output during complete traversal:
Alan Perlis  Allen Newell  Amir Pnueli  Butler W. Lampson  C. Anthony R. Hoare  C.L. Pekeris  Charles W. Bachman  Dana Scott  Alonzo Church  Dennis Ritchie  Dick Karp  Donald E. Knuth  E.F. Codd  Edsger Wybe Dijkstra  Aad van Wijngaarden  Edward Feigenbaum  Fernando J. Corbato'  Herb Simon  Ivan Sutherland  Claude Shannon  Frank Hitchcock  J.H. Wilkinson  John Backus  John Cocke  John H. Holland  Arthur Banks  John Hopcroft  John McCarthy  Juris Hartmanis  Ken Iverson  Howard Aiken  E.L. Chaffee  Ken Thompson  Manuel Blum  Marshall Hall  Marvin Minsky  Albert Tucker  Maurice Wilkes  Michael O. Rabin  Niklaus Wirth  Norman Biezeno  Oswald Veblen  E.H. Moore  H.A. Newton  Oystein Ore  Patrick Fischer  Hartley Rogers  R.L. Matson  R.P. Dilworth  Raj Reddy  Richard Hamming  Richard Stearns  Harold Kuhn  Ralph Fox  Robert E. Tarjan  Robert W. Floyd  Robin Milner  Solomon Lefschetz  Stephen Cook  Hao Wang  Thor Skolem  Axel Thue  Tony Oettinger  William (Velvel) Kahan  William Edward Story  Carl Gottfried Neumann  

Final set of invitees:
Aad van Wijngaarden  Alan Perlis  Albert Tucker  Allen Newell  Alonzo Church  Amir Pnueli  Arthur Banks  Axel Thue  Butler W. Lampson  C. Anthony R. Hoare  C.L. Pekeris  Carl Gottfried Neumann  Charles W. Bachman  Claude Shannon  Dana Scott  Dennis Ritchie  Dick Karp  Donald E. Knuth  E.F. Codd  E.H. Moore  E.L. Chaffee  Edsger Wybe Dijkstra  Edward Feigenbaum  Fernando J. Corbato'  Frank Hitchcock  H.A. Newton  Hao Wang  Harold Kuhn  Hartley Rogers  Herb Simon  Howard Aiken  Ivan Sutherland  J.H. Wilkinson  John Backus  John Cocke  John H. Holland  John Hopcroft  John McCarthy  Juris Hartmanis  Ken Iverson  Ken Thompson  Manuel Blum  Marshall Hall  Marvin Minsky  Maurice Wilkes  Michael O. Rabin  Niklaus Wirth  Norman Biezeno  Oswald Veblen  Oystein Ore  Patrick Fischer  R.L. Matson  R.P. Dilworth  Raj Reddy  Ralph Fox  Richard Hamming  Richard Stearns  Robert E. Tarjan  Robert W. Floyd  Robin Milner  Solomon Lefschetz  Stephen Cook  Thor Skolem  Tony Oettinger  William (Velvel) Kahan  William Edward Story