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Q: How to use CONTINUE statement?

Answer:
CONTINUE is a no-operation placeholder. Useful in EVALUATE when certain conditions need no action: WHEN 'X' CONTINUE. In IF: IF condition CONTINUE ELSE action. Maintains structure without dummy statements. Not a GOTO target.
continue noop control-flow
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Q: What is ALTER statement?

Answer:
ALTER changes GO TO target dynamically. ALTER para-1 TO PROCEED TO para-2. Obsolete-causes maintenance nightmares. Makes flow unpredictable. Use EVALUATE or SET/IF instead. Some shops prohibit. Still legal but strongly discouraged.
alter goto obsolete