Q : "four seas" also indicates the whole world
R : there are three possible symbols here, "to grasp or catch" (which Roth says is the original symbol), "to roll into a ball with the hands", and "to concentrate", and all are equally likely (as far as I can tell), so the word used is a combination of all three
S : the symbol given ("flea") makes no sense; however it seems that it must complete a double negative (do not [neglect/hesitate/fail] to?), because twice below the Nei Ye encourages the reader to make plans
T : there is no subject in this sentence in the original Chinese! But the phrase "that Dao" is used four other times, and "that Dao will naturally arrive" appears below (using different symbols)
U : the five senses
V : these 4 lines are expressing very Confucian ideas; Confucius himself said "Let a person be stimulated by poetry, established in character by the rules of propriety, and perfected by music." (Analects 8.8)
W : the given symbol makes no sense here, but presumably means the opposite of "gorging"
X : while the standard definition is "discipline", according to Waley it literally means "main thread" (as in "of the teaching")
Y : presumably, do not pull desirable things towards you and push undesirable things away
Z : creatures will not "cause harm" in that they will not confuse the senses or the heart/mind (mentioned above)