asterix-graphix/src/main/java/org/apache/asterix/graphix/lang/rewrite/canonical/CanonicalElementExpansionConsumer.java [198:206]:
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            this.ambiguousElement = ambiguousElement;
        }

        @Override
        public void accept(AbstractExpression canonicalExpr, PathPatternExpr pathPatternExpr)
                throws CompilationException {
            EdgePatternExpr ambiguousEdgePattern = (EdgePatternExpr) ambiguousElement;
            VertexPatternExpr ambiguousLeftVertex = ambiguousEdgePattern.getLeftVertex();
            VertexPatternExpr ambiguousRightVertex = ambiguousEdgePattern.getRightVertex();
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asterix-graphix/src/main/java/org/apache/asterix/graphix/lang/rewrite/canonical/CanonicalElementExpansionConsumer.java [226:234]:
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            this.ambiguousElement = ambiguousElement;
        }

        @Override
        public void accept(AbstractExpression canonicalExpr, PathPatternExpr pathPatternExpr)
                throws CompilationException {
            EdgePatternExpr ambiguousEdgePattern = (EdgePatternExpr) ambiguousElement;
            VertexPatternExpr ambiguousLeftVertex = ambiguousEdgePattern.getLeftVertex();
            VertexPatternExpr ambiguousRightVertex = ambiguousEdgePattern.getRightVertex();
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