| honest truth(noun, expression, certainty, principle, fact) |
| illumination(material, tip, data, statistics, facts) |
| income(noun, essence, profit, core, outcome) |
| indispensable content(noun, expression, essence, profit, core) |
| infallibility(noun, certainty, principle, fact, reality) |
| info(noun, study, order, information, note) |
| information(noun, order, note, sign, review) |
| input(noun, study, information, figure, statistics) |
| inside story(expression, material, tip, data, statistics) |
| inside track(noun, expression, certainty, principle, fact) |
| instruction(noun, order, information, note, knowledge) |
| intelligence(noun, order, information, note, sign) |
| intimation(noun, order, information, note, sign) |
| key point(noun, expression, essence, profit, core) |
| know(noun, order, information, note, sign) |
| knowledge(information, material, tip, data, statistics) |
| last word(noun, expression, essence, profit, core) |
| leak(material, tip, data, statistics, facts) |
| learning(material, tip, data, statistics, facts) |
| legitimacy(noun, certainty, principle, fact, reality) |