Greetings!
You may read this post “The Sōtapanna Stage” with the explanation of kalyāṇa from the Upaḍḍha Sutta (SN 45.2).
“kalyāṇa” means to “help remove defilements,” and “mittatā” is a friendship; “sahāyatā” is companionship; and “sampavaṅkatā” is close association.
kalyāṇamittatā means friendship that help remove defilements.
kalyāṇasahāyatā means companionship that help remove defilements.
kalyāṇasampavaṅkatā means close association that help remove defilements.
With mettā, Seng Kiat