first step, build encoding tables based on the documentation: data encSimple encEnhanced; s='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-.'; format raw 8. enc $8.; raw=.; enc='_'; output encSimple; enc='__'; output encEnhanced;...
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