11.   The practice involves simultaneously buying and reselling energy at the same price for a zero net profit or loss to generate higher total sales volume and revenue.

12.   These practices involve activities, beliefs, attitudes, institutional settings, even styles of action.

13.   For girls, the practice can involve clipping or burning the clitoris and cutting the external genitals.

14.   She was kept off the ice because the initial practices did not involve her numbers and because tour organizers were cautious about her health.

15.   The practice involved those players who did not start in a training match the previous night against Vegalta Sendai.

16.   The practice usually involves army servicemen.

17.   The practice involves withdrawing blood, subjecting it to ultraviolet irradiation treatment for a few minutes and reinjecting it.

18.   The practice involves the cutting away of part or all of the clitoris and is usually performed at the advent of puberty.

19.   Such practices involve mostly major investors and senior company executives, who leak information to the market with the aim of influencing prices and making quick profits.