• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

• Top
• 5 · Abstract Ideas and Concepts
• 54 · Process of Action
• 54E · Reciprocal Action
• 54E1 · Co-operation, Association
• 54E11 · Necessity of Mutual Co-operation

54E11(+4) · Necessity of Mutual Co-operation (+ emblematical representation of concept)