G. [θ], [ð] became [s] before [p], [t], [k], [b] and [s]; [{θð}{ptkbs}] > [s{ptkbs}]

⚠️G. [θ], [ð] became [s] before [p], [t], [k], [b] and [s]; [{θð}{ptkbs}] > [s{ptkbs}]
HPG/§2.4 @@@ {hath hadh before vowels >>} has before stops and s (GL/48)

Phonetic Rule Elements

[ðk] > [sk]
[ðs] > [ss]
[ðt] > [st]
[θk] > [sk]
[θs] > [ss]
[θt] > [st]

Phonetic Rule Examples

tuðk > tusk ðk > sk ᴱ√tudh- > G. tusc ✧ GL/72
beðs > bess ðs > ss ᴱ√Beđ > G. bess ✧ GL/22
guðta- > gusta- ðt > st ᴱ√gudh > G. gusta- ✧ GL/42
gʷaðt > gʷaðt ðt > st ᴱ√ŋwa- > G. gwast ✧ GL/47
gʷiðt > gʷist ðt > st ᴱ√gu̯iđ > G. gwist ✧ GL/46
aiθk > aisk θk > sk ᴱ✶aith-k > G. aisc ✧ GL/31
eθk > esk θk > sk ᴱ✶aith-k > G. esc ✧ GL/31
heθk > hesk θk > sk ᴱ√heth² > G. hesc ✧ GL/49
haθs- > hass- θs > ss ᴱ√AS > G. has ✧ GL/48
heθt > hest θt > st ᴱ√heth¹ > G. hest ✧ GL/48