[harlowe] Come back after a year. Can you tell me what's wrong with this expression?

Sorry to bother you again, but I have been trying to make an expression that doesn't show the exact quality of an item, instead showing some words describing it. But until now, I have had no luck.

Can you point out what am I doing wrong?

(if: $quality =< 90 then [(put: "decent")] elseif: $quality > 90 and it is =<120 then [(put: "above average")] elseif: $quality > 120 and it is =<150 then [(put: "relatively superior")] elseif: $quality < 150 then [(put: ""outstanding"")] else: [(put: "error")])