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The results showed that the sensor can detect locations of external forces applied on the sensor surface due to the multiple layers of sensing elements .
 machine or equipment: sensor; concept or principle: forces; machine or equipment: sensor; application: sensing; material: elements
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: sensor, forces, sensor, sensing, elements 
Answer:
 machine or equipment: sensor; concept or principle: forces; machine or equipment: sensor; application: sensing; material: elements