14.17 Changes Introduced in Version 4.2.1

See 4.2.0 Changes for changes introduced in SICStus Prolog 4.2.

• 4.2.1 New Features:  New Features
• 4.2.1 Bugs Fixed:  Bugs Fixed
• 4.2.1 Other Changes:  Other Changes
• 4.2.1 Known Issues:  Known Issues
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