(A)Thematic and nasalized forms of *H2ep-

Hamp on "Evidence on Laryngeals in Albanian" wrote:

4.1. háp ‘to open’: Hittite <apa> ‘afterwards’, ‘again, back’;
Hieroglyphic Hittite <apan(a)> ‘back, again’, Lycian <epn>; Skt.
<ápa> ‘away, forth’; Greek <apo>, Lat. <ab> ‘from’; Greek
<aps> ‘backwards, back, again’; Lat. <absque> ‘without’. On the
basis of non-Albanian forms Sturtevant reconstructs IH *hep-. This
fits the Albanian evidence perfectly (Proto-Albanian *hápo:). In
Albanian derivative <prapë> ‘again’ it appears we have *per- > *prV-
plus *hap-; in that case *h seems to be subsequently lost after /+/,
or else after close juncture.
[I guess that we have the same formation in <predhë> ‘missile,
projectile’, derived from *per- > *prV- plus *hedh ‘to throw, jump’]

I think that Hamp forgot to mention other important derivative:
<prapa> ‘back’ (cf. Hittite and other forms, that contain this
meaning too). Standard Alb. form <mbrapa> ‘id.’, derived from prefix
*ambhi- + *per- + *H2ep-o. Synonym of this adverb is Tosk <pas>, Geg
<m(b)as>, which to my view, is derived from athematic form *ambhi +
*H2ep-ti > mbë + hapty > mbas (pt > t and *ty > s). Geg variant <
(i,e) mbrâmë> ‘last’, derived from double prefixed nasalized form m-
+ prV- + hamp-. Other interesting derivative are: adjective <i
mrapshtë/i prapshtë> ‘regressive’ derived from *per- + *H2epo + *-
sto, abstract noun in â€"i <prapshti/mbrapshti> ‘regression’ (today
<prapavajtje> ‘to go back’); cf. <mbarësi> ‘progression’, derived
from Alb. adjective <i parë> ‘first’, adverb <para> ‘forward’. I
found more recent formations Alb. verb <z•brap•s> ‘to back up,
retreat’ (synonym <z•byth>), <për•hap> ‘to spread’,
<prapanicë> ‘ass’ (synonym <bythë>).

First of all, I am interested to know is it possible to be derived
from a simple root *H2ep-o (thematic form), *H2ep-ti (athematic
form) and *H2emp-o (nasalized form) such amount of derived words:

1. Thematic form *H2p-o: hap ‘to open’, prapë ‘again’, prapa ‘back’,
përhap ‘to spread’, prapa•nicë ‘ass’, parapa•nik ‘regressive’ (i
prapë/i mbrapshtë), prapa•mbes ‘to stay back’,
prapavajtje ‘regression’ (prapshti/mbrapshti);

2. Athematic form: *H2ep-ti: pas/mbas ‘back, after’,
përmas/përpas ‘on the back’, i pasmë / i sprasmë ‘last’ (Gavrill
Dara i Ri, “Kënga e sprasme e Balës” - Last Bala’s song);

3. Nasalized form: *H2emp-ti: i mbrâmë ‘last’, maybe
<mbâmje/mbrëmje> ‘evening, literally last part of the day,
<mbrëmë> ‘last night’ etc.

Any suggestions, help?

Konushevci