AAPKA DICTIONARY NO FURTHER A MYSTERY

Is there any motive in addition to politics why all ideas for nuclear pulse propulsion happen to be abandoned?I do think the discussion about /x/ and /χ/ is superfluous. I checked many WIKI-web pages and when the a person suggests that /x/ is Erroneous one other suggests /x/ is suitable. /message /verifyErrors The word in the example sentence does