From these causes such statements are quite worthless, and can form no basis for the calculation of percentages, or suchlike strict arithmetical treatment.
Natural rubber offers good elasticity, while synthetic materials tend to offer better resistance to environmental factors such as oils, temperature, chemicals or ultraviolet light and suchlike.
The moody gagsters reported unusually high levels of non-standard mental experiences (paranormal events and suchlike), disorganised thinking, absence of intimacy and impulsive behaviour.
He never really "sings", rather he murmurs, shouts, screams or speaks, and this wide range of tonality has presented in the past often insurmountable problems for engineers, technicians and suchlike.