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MIX unflavored gelatine and granulated sugar substitute in medium microwaveable bowl until blended. Stir in soda. Let stand 3 min. or until gelatine is softened. Microwave on HIGH 3 min. or until gelatine and sugar substitute are dissolved, stirring after each minute. Pour into 8-inch square dish sprayed with cooking spray.
REFRIGERATE 25 to 30 min. or until set but not firm. Meanwhile, add boiling water to raspberry gelatin mixes in separate medium bowl; stir 2 min. until completely dissolved. Stir in cold water. Cool 15 min.
POUR raspberry gelatin gently over clear gelatine layer in dish. Refrigerate 1 hour or until firm. Cut into 36 squares; top with raspberries just before serving.