:: t(real).
persistent(f)?
f<<-t(7)?

:: ga. f=t,write("OK!"),nl?
:: gb. f=t,write("OK!"),nl?
:: gd. f=t,write("OK!"),nl?
:: ge. f=t,write("OK!"),nl?
:: gf. f=t,write("OK!"),nl?
:: gg. f=t,write("OK!"),nl?
:: gh. f=t,write("OK!"),nl?
:: gi. f=t,write("OK!"),nl?
:: gj. f=t,write("OK!"),nl?
:: gk. f=t,write("OK!"),nl?
:: gl. f=t,write("OK!"),nl?
:: gm. f=t,write("OK!"),nl?
:: gn. f=t,write("OK!"),nl?
:: go. f=t,write("OK!"),nl?
:: gp. f=t,write("OK!"),nl?
:: gq. f=t,write("OK!"),nl?
:: gr. f=t,write("OK!"),nl?
:: gs. f=t,write("OK!"),nl?
:: gt. f=t,write("OK!"),nl?
:: gu. f=t,write("OK!"),nl?
:: gv. f=t,write("OK!"),nl?
:: gw. f=t,write("OK!"),nl?
:: gx. f=t,write("OK!"),nl?
:: gy. f=t,write("OK!"),nl?
:: gz. f=t,write("OK!"),nl?
