Synonyms to rule of deduction

dilemma, Aristotelian sorites, Goclenian sorites, Gordian knot, Scylla and Charybdis, baffle, bafflement, bewilderment, bind, bother, box, catch-22, categorical syllogism, choice of Hercules, confoundment, confusion, corner, crux, deadlock, difficulty, discomposure, disconcert, disconcertedness, disconcertion, disconcertment, disturbance, embarrassment, enigma, enthymeme, figure, fix, hole, impasse, jam, knot, knotty point, mode, modus tollens, mood, mystery, mystification, no choice, node, nodus, nonplus, only choice, oxymoron, paradox, paralogism, perplexity, perturbation, pickle, plight, pons asinorum, poser, pother, predicament, problem, prosyllogism, pseudosyllogism, puzzle, puzzlement, quandary, riddle, rule, scrape, snooker, sorites, spot, squeeze, stalemate, stew, stymie, syllogism, teaser, trouble, unassuredness, upset, vexed question, Establishment, Platonic body, Platonic form, Platonic idea, VIP, accept, acclaim, acknowledge, act, acute-angled triangle, add, adornment, adumbrate, advert to, aesthetic form, algebraize, allude to