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1区
el., sec.sys.	sone 1
20区
el., sec.sys.	sone 20
22区
el., sec.sys.	sone 22
0区
el., sec.sys.	sone 0
2区
el., sec.sys.	sone 2
21区
el., sec.sys.	sone 21

区: 2 phrases in 2 subjects

Electric machinery	1
Electronics	1