::vowel:: = a|ä|e|i|o|ö|u|ü
::consonant:: = b|c|ch|ck|d|dt|f|g|h|j|k|l|m|n|p|pf|r|s|sch|t|tsch|tz|tzsch|v|w|z|ʀ

% -tion for Latin loanwords
t -> z / _ ion

% Retraction of initial <s> before plosives
s -> sch / # _ (p|t)

% Initial voicing of <s>
s -> <zed> / # _ (::vowel::)

% Final obstruent devoicing
b -> p / _ #|(::consonant::)(::vowel::)
d -> t / _ #|(::consonant::)(::vowel::)
g -> k / _ #|(::consonant::)(::vowel::)

% Handling of r
er -> ɐ / _ #
r -> ɐ / [äeioöuü]h? _ #|(::consonant::)
r -> 0 / a _ #|(::consonant::)
r -> ʀ / (::vowel::)h? _ (::vowel::)

% Final schwa
e -> ə / _ #

% Open syllable lengthening
i -> ie /  _ #|(::consonant::)(::vowel::)
e -> ee / [^ei] _ #|(::consonant::)(::vowel::)
ü -> üh /  _ #|(::consonant::)(::vowel::)
ö -> öo /  _ #|(::consonant::)(::vowel::)
u -> uh /  _ #|(::consonant::)(::vowel::)
o -> oo / [^oö] _ #|(::consonant::)(::vowel::)
a -> aa / [^a] _ #|(::consonant::)(::vowel::)