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  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  C.L. Pekeris  Alonzo Church  Patrick Fischer  Tony Oettinger  Marshall Hall  John H. Holland  Aad van Wijngaarden  Claude Shannon  R.L. Matson  Solomon Lefschetz  R.P. Dilworth  Howard Aiken  Albert Tucker  Harold Kuhn  Hao Wang  Oswald Veblen  Hartley Rogers  Oystein Ore  Arthur Banks  Norman Biezeno  Frank Hitchcock  William Edward Story  E.L. Chaffee  Ralph Fox  E.H. Moore  Thor Skolem  Carl Gottfried Neumann  H.A. Newton  Axel Thue  

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