Verites/verigraph

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            <string>curly</string>
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                <string>type:down</string>
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            <attr name="label">
                <string>type:floor</string>
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            <attr name="label">
                <string>holds</string>
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            <attr name="label">
                <string>higher_than</string>
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                <string>type:request</string>
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        <edge from="n3" to="n3">
            <attr name="label">
                <string>call</string>
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