Dear Yong Peng,

> thanks for that. I am not very sure. Can you elaborate it? Thank you.

As I wrote,
> Dhammapada-Atthakatha explains that 'dhammaa' is here the mental
> processes - recognition (sa~n~naa), feeling (vedanaa) and intention
> (sa"nkhaara).

Here is a passage from Dhammapada-Atthakatha (note the phrase at the end):

Dhammaati gu.nadesanaapariyattinissattanijjiivavasena cattaaro dhammaa
naama. Tesu–
“Na hi dhammo adhammo ca, ubho samavipaakino;
adhammo niraya.m neti, dhammo paapeti suggatin”ti. (theragaa.
304; jaa. 1.15.386)–
Aya.m gu.nadhammo naama. “Dhamma.m vo, bhikkhave, desessaami
aadikalyaa.nan”ti (ma. ni. 3.420) aya.m desanaadhammo naama. “Idha
pana, bhikkhave, ekacce kulaputtaa dhamma.m pariyaapu.nanti sutta.m
geyyan”ti (ma. ni. 1.239) aya.m pariyattidhammo naama.
“Tasmi.m kho pana samaye dhammaa honti, khandhaa hontii”ti (dha.
sa. 121) aya.m nissattadhammo naama, nijjiivadhammotipi eso eva.
Tesu imasmi.m .thaane nissattanijjiivadhammo adhippeto. So atthato tayo
aruupino khandhaa vedanaakkhandho sa~n~naakkhandho sa"nkhaarakkhandhoti.

> Mano here is sixth faculty of perception

and as explained at the link
> http://www.lioncity.net/buddhism/index.php?showtopic=22507

it is an integrating and supervising faculty.

Atthakatha explains the relation of 'mano' to mental processes as
'condition of arising' (uppaadapaccaya):

Ete hi mano pubba"ngamo etesanti manopubba"ngamaa naama.
Katha.m panetehi saddhi.m ekavatthuko ekaaramma.no apubba.m
acarima.m ekakkha.ne uppajjamaano mano pubba"ngamo naama hotiiti?
Uppaadapaccaya.t.thena. Yathaa hi bahuusu ekato gaamaghaataadiini
kammaani karontesu “ko etesa.m pubba"ngamo”ti vutte yo nesa.m paccayo
hoti, ya.m nissaaya te ta.m kamma.m karonti, so datto vaa mitto vaa
tesa.m pubba"ngamoti vuccati, eva.msampadamida.m veditabba.m. Iti
uppaadapaccaya.t.thena mano pubba"ngamo etesanti manopubba"ngamaa.
Na hi te mane anuppajjante uppajjitu.m sakkonti, mano pana ekaccesu
cetasikesu anupajjantesupi uppajjatiyeva. Adhipativasena pana mano
se.t.tho etesanti manose.t.tho. Yathaa hi coraadiina.m
coraje.t.thakaadayo adhipatino se.t.thaa. Tathaa tesampi mano
adhipati manova se.t.thaa. Yathaa pana daaru-aadiihi nipphannaani
taani taani bha.n.daani daarumayaadiini naama honti, tathaa tepi
manato nipphannattaa manomayaa naama.

> One can see how 'mano' conditions mental processes, on the chart of
> dependent co-arising
> http://dhamma.ru/lib/paticcas.htm

since mano is one of the sixth ayatanas, which produce phassa, and
henceforth mental processes.

'Sukha' and 'Dukkha', about which the first Dhammapada verse is about,
are two kinds of 'vedanaa', which are conditioned by work of 'mano'.

Best wishes,
Dmytro