7553
Tensile test specimens were designed and printed in three types : ( A ) a single-material specimen printed by a single extrusion head ; ( B ) a single-material but multi-section specimen printed in a zebra-crossing structure by two extrusion heads ; and ( C ) a multi-material specimen printed with two materials in a zebra-crossing pattern .
 process characterization: Tensile test; engineering feature: designed; machine or equipment: extrusion head; material: B; concept or principle: structure; machine or equipment: extrusion heads; material: C; concept or principle: multi-material; concept or principle: materials; concept or principle: pattern
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: Tensile test, designed, extrusion head, B, structure, extrusion heads, C, multi-material, materials, pattern 
Answer:
 process characterization: Tensile test; engineering feature: designed; machine or equipment: extrusion head; material: B; concept or principle: structure; machine or equipment: extrusion heads; material: C; concept or principle: multi-material; concept or principle: materials; concept or principle: pattern