4. The greater activity and selectivity of these sieve catalysts make it possible to obtain much higher yields of gasoline fractions - as much as 20 to 30 per cent in some units - than was possible with conventional silica-alumina types.

　　5. So strongly ingrained are our habits, though this varies from person to person, that, sometimes, when a conscious effort is made to be creative, automatic response takes over.

　　6. So, for many people, their actions and behaviour are set in immovable blocks, their minds clogged with the cholesterol of habitual actions, preventing them from operating freely, and thereby stifling creation.

　　7. School, later university and then work teach us to regulate our lives, imposing a continuous process of restrictions, which is increasing exponentially with the advancement of technology.

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