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• There are several distinct annealing stages.

• Elemental carbon exists in two well-defined crystalline allotropic forms.

• These compounds have clearly (or sharply) defined thermodynamic properties.

• These copolymers have a less pronounced (or marked) block structure.

• He has observed clear-cut changes of crystal habit.

• The excited state-producing step occurs in a separate, well-defined reaction.

• Well-marked differences have been discovered between ...