bt chap. 21

w24.11 p. 22 par. 12

w24.11 pp. 22-23 pars. 8-13

w24.11 pp. 21-24 pars. 5-14

w24.11 p. 24 par. 16

lff lesson 36 point 3

lff lesson 52 point 3

mwb19.08 p. 5

lff lesson 42 points 1-7

mrt article 63 pars. 13-14

w25.02 p. 5 par. 18

bt chap. 21