17.from 18.for 19.of,of 20.for
21.to 22.At 23.for 24.in,in 25.of
26.at 27.to 28.on,on,in
29.with 30.As,In 31.from,keep 32.to,fo
17.from 18.for 19.of,of 20.for
21.to 22.At 23.for 24.in,in 25.of
26.at 27.to 28.on,on,in
29.with 30.As,In 31.from,keep 32.to,fo