scenario #1: anna owns the amiga.
scenario #2: david owns the amiga.
scenario #3: cannot identify the amiga owner.
scenario #4: cannot identify the amiga owner.
scenario #5: chris owns the amiga.
scenario #6: ellen owns the amiga.
scenario #7: cannot identify the amiga owner.
scenario #8: david owns the amiga.
scenario #9: ellen owns the amiga.
scenario #10: chris owns the amiga.
scenario #11: cannot identify the amiga owner.
scenario #12: david owns the amiga.
scenario #13: chris owns the amiga.
scenario #14: cannot identify the amiga owner.
