prerequisite P|R|IH|R|EH|K|W|AX|Z|AX|T P|R|I|R|I|K|W|AX|Z|AX|T P|R|IH|R|I|K|W|AX|Z|AX|T P|R|I|R|EH|K|W|AX|S|AX|T P|R|IH|R|EH|K|W|AX|S|AX|T P|R|I|R|I|K|W|AX|S|AX|T P|R|IH|R|I|K|W|AX|S|AX|T something SH|AH|M|TH|IH|NG S|O|M|TH|IH|NG SH|O|M|TH|IH|NG S|AH|M|T|IH|NG SH|AH|M|T|IH|NG S|O|M|T|IH|NG SH|O|M|T|IH|NG S|AH|M|TH|I|NG SH|AH|M|TH|I|NG S|O|M|TH|I|NG SH|O|M|TH|I|NG S|AH|M|T|I|NG SH|AH|M|T|I|NG S|O|M|T|I|NG SH|O|M|T|I|NG that D|AE|T DH|A|T D|A|T is I|Z IH|S I|S required R|IH|K|W|IH|ER|D R|I|K|W|A + I|I R|D R|IH|K|W|IH|I R|D R|I|K|W|A + I|ER|JH R|IH|K|W|IH|ER|JH R|I|K|W|A + I|I R|JH R|IH|K|W|IH|I R|JH or U|R necessary N|I|S|AX|S|I|R|I N|EH|SH|AX|SH|EH|R|I N|I|SH|AX|SH|I|R|I N|EH|S|AX|S|EH|R|IH N|I|S|AX|S|I|R|IH N|EH|SH|AX|SH|EH|R|IH N|I|SH|AX|SH|I|R|IH as A|Z AE|S A|S a prior P|R|IH|ER P|R|A + I|I R P|R|IH|I R condition K|AX|N|JH|IH|SH|AX|N K|AX|N|D|I|SH|AX|N K|AX|N|JH|I|SH|AX|N K|AX|N|D|IH|S|AX|N K|AX|N|JH|IH|S|AX|N K|AX|N|D|I|S|AX|N K|AX|N|JH|I|S|AX|N