5577
Use of bidirectional scanning strategy enforced epitaxial growth of grains across melt pools present within a single printed layer .
 scanning strategy, epitaxial, grains, melt pools, layer
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 scanning strategy, epitaxial, grains, melt pools, layer