what is the {end time} for {Martha Graham} has {educated at} as {Denishawn School of Dancing and Related Arts} ?
Martha Graham graduate from Denishawn School of Dancing and Related Arts in which year?
When did Martha Graham graduate from Denishawn School of Dancing and Related Arts?
SELECT ?l WHERE { ?q property:end_time ?l . resource:Martha_Graham property:educated_at ?q . ?q property:educated_at resource:Denishawn_School_of_Dancing_and_Related_Arts }
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} 

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