input: [CIRCULAR to 1720] The meaning of life? How to survive? The most ideal state? [PROGRESSIVE c. 1720-1790] What are the stages of growth? How can one improve life on earth? [PESSIMISM c. 1790-1820] How to avoid the dangers ahead? Economic, demographic and political dangers [EVOLUTIONARY c. 1840-1890] Origins of humans. Placing civilizations on ladders. Dynamics of evolution. Homogeneity. [DIFFUSIONIST c. 1890-1920] Where have things originated? How do ideas and techniques spread? [0] 
output: QUESTION
options: P E O P L E
options: T I M E
options: P O W E R
options: M E T A P H O R
options: Q U E S T I O N
options: M O D E L
options: V A L U E