If there are two or more aggregations to the same aggregate, a conforming tool may as a purely presentational option show them as a tree by merging the aggregation ends into a single segment adorned by the solid or hollow aggregation diamond symbol.

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MagicDraw/Cameo tool support for Association composition "trees" is not good, and they end up being fiddly to maintain (and they can also cause issues for InformationFlows). Avoid them!
Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
Association
Association::memberEnd
Full quote
If there are two or more aggregations to the same aggregate, a conforming tool may as a purely presentational option show them as a tree by merging the aggregation ends into a single segment adorned by the solid or hollow aggregation diamond symbol.
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This notation is not supported by Magic Cyber-Systems Engineer® (Cameo Systems Modeler®) and contriving the notation be overlapping Association line symbols is not recommended by Webel
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