180050
But , whereas the conformal Laplacian is second-order , with leading symbol a multiple of the Laplace – Beltrami operator , the Paneitz operator is fourth-order , with leading symbol the square of the Laplace – Beltrami operator .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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