you don’t have to calculate it you can just work through it manually. start with the one and two letter words first “h” can only be one of two things, either “a” or “i” but u know jhll is pass so that narrows it down. then sub out all the h’s for “a” or “i” depending on which u decide to try. then move out to two letter words like CL. you already know that “L” is “s” since you know jhll is pass so “c” can only be one of to things. just keep at it in this manner look for patterns in spelling and make educated guesses.