Сколько веществ изображено: 1) СH3 - CH2 - CH2 | CH3 2) CH3 - CH - CH3 | CH3 3) CH3 | CH2 - CH2 - CH - CH2 - CH3 4) CH3 | CH2 - CH2 | CH3 5) CH3 - CH - CH = CH2 | C2H5 6) CH3 | CH3 - CH = CH - CH - CH3
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