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Pairs

• Aunts and Butlers (Robin Douglas Johnson; 2006; Versificator).
• Book and Volume (Nick Montfort; 2005; Z-code).
• Chicken and Egg (Adam Thornton; 1998; Z-code).
• Color and Number (Steven Kollmansberger; 2002; TADS 2).
• Earth and Sky (Paul O'Brian; 2001; Z-code).
• Lists and Lists (Andrew Plotkin; 1996; Z-code).
• Lock & Key (Adam Cadre; 2002; Glulx).
• Once and Future (G. Kevin Wilson; 1998; TADS 2).
• Snakes and Ladders (Ken Franklin; 2004; ADRIFT).
• Spider and Web (Andrew Plotkin; 1998; Z-code).