17. Ill-managed business is unprofitable; Railways are never ill-managed. All railways are profitable. Univ. "business"; m = ill-managed; x = profitable; y = railways. m_{1}x_{0} + y_{1}m_{0} ¶ x'y'_{1} [Fig. III. Conclusion wrong: right one is "Some business, other than railways, is profitable." 18. No Professors are ignorant; All ignorant people are vain. No Professors are vain. Univ. "people"; m = ignorant; x = Professors; y = vain. xm_{0} + m_{1}y'_{0} ¶ x'y_{1} [Fig. III. Conclusion wrong: right one is "Some vain persons are not Professors." 19. A prudent man shuns hyænas. No banker is imprudent. No banker fails to shun hyænas. Univ. "men"; m = prudent; x = shunning hyænas; y = bankers. m_{1}x'_{0} + ym'_{0} ¶ x'y_{0} [Fig. I. Conclusion right. 20. All wasps are unfriendly; No puppies are unfriendly. No puppies are wasps. Univ. "creatures"; m = friendly; x = wasps; y = puppies. x_{1}m_{0} + ym'_{0} ¶ x_{1}y_{0} [Fig. I (a). Conclusion incomplete: complete one is "Wasps are not puppies". 21. No Jews are honest; Some Gentiles are rich. Some rich people are dishonest. Univ. "persons"; m = Jews; x = honest; y = rich. mx_{0} + m'y_{1} No Conclusion. [Fallacy of Unlike Eliminands with an Entity-Premiss.] pg153 22. No idlers win fame; Some painters are not idle. Some painters win fame. Univ. "persons"; m = idlers; x = persons who win fame; y = painters. mx_{0} + ym'_{1} No Conclusion. [Fallacy of Unlike Eliminands with an Entity-Premiss.] 23. No monkeys are soldiers; All monkeys are mischievous. Some mischievous creatures are not soldiers. Univ. "creatures"; m = monkeys; x = soldiers; y = mischievous. mx_{0} + m_{1}y'_{0} ¶ x'y_{1} [Fig. III. Conclusion right. 24. All these bonbons are chocolate-creams; All these bonbons are delicious. Chocolate-creams are delicious. Univ. "food"; m = these bonbons; x = chocolate-creams; y = delicious. m_{1}x'_{0} + m_{1}y'_{0} ¶ xy_{1} [Fig. III. Conclusion wrong, being in excess of the right one, which is "Some chocolate-creams are delicious." 25. No muffins are wholesome; All buns are unwholesome. Buns are not muffins. Univ. "food"; m = wholesome; x = muffins; y = buns. xm_{0} + y_{1}m_{0} No Conclusion. [Fallacy of Like Eliminands not asserted to exist.] 26. Some unauthorised reports are false; All authorised reports are trustworthy. Some false reports are not trustworthy. Univ. "reports"; m = authorised; x = true; y = trustworthy. m'x'_{1} + m_{1}y'_{0} No Conclusion. [Fallacy of Unlike Eliminands with an Entity-Premiss.] 27. Some pillows are soft; No pokers are soft. Some pokers are not pillows. Univ. "things"; m = soft; x = pillows; y = pokers. xm_{1} + ym_{0} ¶ xy'_{1} [Fig. II. Conclusion wrong: right one is "Some pillows are not pokers."