education(s) question(s) moral(s) rethoric(s)

problem(s)         explanation(s)  algorithm(s)
    
 definition(s)   theorem(s)   proof(s)  code(s) 

law(s)  statement(s)    model(s)  conjecture(s)

site -- payoff(s) / challenge(s) / game(s) / math(s) / plan(s)

life(s) / closure(s) / reflect(s) / fight(s) / reference(s)