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Hello,</div>
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I was trying to understand the recent changes to the Norwegian stemmer, in particular step 1 for "<b><i>ers</i></b>". The rule states:</div>
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<dt class="elementToProof"><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">(<i>b</i>)
<b><i>ers</i></b> </span></dt><dd class="elementToProof"><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">find the longest suffix preceding
<b><i>ers</i></b>, and perform the action indicated. </span>
<dl><dt><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">(<i>i</i>>
<b><i>amm ast ind kap kk lt nk omm pp v øst</i></b> </span></dt><dd><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">do nothing
</span></dd><dt><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">(<i>ii</i>>
<b><i>giv hav skap</i></b> </span></dt><dd><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">delete
<b><i>ers</i></b> suffix </span></dd></dl>
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Something I'm confused by is that "balders" gets stemmed to "bald", according to the output files. Why is the "ers" removed in this case? It isn't proceeded by "giv", "hav", or "skap", so it shouldn't be deleted. And nothing in step 2 or 3 is looking at "ers",
so it shouldn't be getting removed there.</div>
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<span style="font-size: 12pt;">Also, I'm confused by where it says for "<b><i>amm ast ind kap kk lt nk omm pp v øst</i></b>" to "do nothing"? Why are these explicitly mentioned? If it isn't "</span><span style="font-size: 16px; background-color: rgb(255, 255, 255);"><b><i>giv
hav skap</i></b></span><span style="font-size: 12pt;">", then nothing should happen anyway, right? If "ers" is proceeded by "bald", I would expect for it to not delete anything.</span></div>
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I tried looking at the Snowball code and I noticed this:</div>
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'giv' 'hav' 'skap' ''<br>
(delete)</div>
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There is a blank '' included in the list of values in front of the suffix that would trigger a delete. What does that imply, it's not explained in the docs.</div>
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Thank you for any clarification,</div>
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Blake</div>
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