perustua

Verb

 * 1) to be based on  e.g. of a work of art
 * 2) to be based on, be grounded in  e.g. of an opinion
 * 3) to be founded on, be based on, rest on  e.g. of some sort of system
 * 1) to be founded on, be based on, rest on  e.g. of some sort of system
 * 1) to be founded on, be based on, rest on  e.g. of some sort of system