[□] □ □ □
[□ | □] □ □ □
[!□] □ □ □
Bar and liquid cleansers can be divided into 3 basic types , as follows : ( 1 ) true soaps composed of long chain fatty acid alkali salts with a pH of 9-10 ; ( 2 ) combars composed of alkaline soaps to which surface active agents have been added , also with a pH of 9-10 ; and ( 3 ) syndet , or synthetic detergent , bars composed of synthetic detergents and fillers that contain less than 10 % soap and that have an adjusted pH of 5.5-7 . These are material electrochemistry issues that cannot be addressed by the computational code as it is now written , but are areas identified for future work . Decisions about classes or groups into which recognized objects are classified are based on such knowledge - - knowledge about objects and their classes gives the necessary information for object classification . Quantifying the ecological niche for a taxa requires long term ( ~ 10 years ) of field study , complimented by computer-based modelling and statistical analysis ( eg . These requirements are specified in such a manner that the public is protected against unreasonable risk of crashes occurring as a result of the design , construction , or performance of motor vehicles and is also protected against unreasonable risk of death or injury in the event crashes do occur .