2446
Hardness increased progressively with the graphene content and was unaffected by variation in the laser power .
 machanical property: Hardness; material: graphene; concept or principle: variation; process parameter: laser power
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: Hardness, graphene, variation, laser power 
Answer:
 machanical property: Hardness; material: graphene; concept or principle: variation; process parameter: laser power