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In high layer deposition , where side support is absent , the depth of the molten pool at the rear part is almost flat in the Y direction .
 process parameter: layer; concept or principle: deposition; application: support; concept or principle: molten pool; material: Y
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 process parameter: layer; concept or principle: deposition; application: support; concept or principle: molten pool; material: Y