These crimes generally involve less technical expertise. Games generally involve mental or physical stimulation, and often both. The relationship often does not involve money. Games generally involve mental or physical stimulation, and sometimes both. These may involve private investment as well. Dimensional modeling does not necessarily involve a relational database. Several intentional torts do not involve land. Thus, sexual harassment need not involve physical contact. Usually, but not always, this does not involve penetration. On sandbox, the game does not involve those aspects. It can also involve discovering how they act. Often such words involve trade or handicrafts. This might involve planning and rehearsing osteotomies, for example. In the warmer months, these activities often involve water. This policy does not involve safety issues.