When I run zlm with several clusters (I have clusters 1-7), how to compare 1 cluster versus all the others?

zlmCond <- zlm(formula = ~leiden_r0.3 + n_genes, sca=sca, method = "glm")
1_vs_others <- summary(zlmCond, logFC = TRUE, doLRT = 'leiden_r0.31')

Error Term(s) 'leiden_r0.31 ,' not found. Terms available: (Intercept) , leiden_r0.32 , leiden_r0.33 , leiden_r0.34 , leiden_r0.35 , leiden_r0.36 , leiden_r0.37 , n_genes