c(person("Abdisalam", "Hassan","Muse" email="abdisalam.h.muse@gmail.com", role=c("aut", "ctb","cre")), person("Samuel", "Mwalili", role=c("ctb")), person("Oscar", "Ngesa", role=c("ctb")), person("Mutua", "Kilai", role = c("ctb")) )

c(person("Abdisalam", "Hassan","Muse" email="abdisalam.h.muse@gmail.com", role=c("aut", "ctb","cre")), person("Samuel", "Mwalili", role=c("ctb")), person("Oscar", "Ngesa", role=c("ctb")), person("Mutua", "Kilai", role = c("ctb")) ) has worked on 1 package so far. In total, c(person("Abdisalam", "Hassan","Muse" email="abdisalam.h.muse@gmail.com", role=c("aut", "ctb","cre")), person("Samuel", "Mwalili", role=c("ctb")), person("Oscar", "Ngesa", role=c("ctb")), person("Mutua", "Kilai", role = c("ctb")) ) has worked with 1 other author on those packages. Nice teamwork!