Order of coefficients in complex contrast

Question

In my data, the output variable is chicken weight and the independent variable - Feed, has six different factors: casein, horsebean, linseed, meatball, soybean, sunflower. I make the Feed variable as factor with the code in R below:

levels(chickwts$feed)
chickwts$feed <- factor(chickwts$feed, labels = c('casein',
                                                   'horsebean',
                                                   'linseed',
                                                   'meatmeal',
                                                   'soybean',
                                                   'sunflower'))

I want to do a contrast between the average of the bean feeds (horsebean and soybean feeds) and the average of the seed feeds (linseed and sunflower feeds). From my understanding, the coefficient should be c(0, .5, -.5, 0, .5, -5), which follows the label order in the above code.

Then I will use the library(emmeans) to conduct analysis.

c.weights1 <- c(0, .5, -.5, 0, .5, -5)
emmeans.output1 <- emmeans(anova_result,'feed',contr=list('horesbean and soybean vs linseed and sunflower'=c.weights1))
emmeans.output1

Is it correct? I’m not sure about the order of coefficients and what determines the order of coefficients. Does it follow the order that I created in the

chickwts$feed <- factor(chickwts$feed, labels = c('casein',
                                                   'horsebean',
                                                   'linseed',
                                                   'meatmeal',
                                                   'soybean',
                                                   'sunflower'))