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The normative grammar is ambiguous with respect to the eclRefinement rule. Suppose we are trying to parse the following constraint:
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< 404684003 |Clinical finding| :
363698007 363698007 |Finding site|= << 39057004 |Pulmonary valve structure| ,
116676008 |Associated morphology| = << 415582006 |Stenosis|
116676008 |Associated morphology| = << 415582006 |Stenosis|
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