hentaigana variant of iroha

Version from 現今児童重宝記 <https://www.sljfaq.org/afaq/iroha.html>
(No. 6) painstakingly matched to unicode glyphs described on
<https://en.wikipedia.org/wiki/Hentaigana?oldid=935497055>
with uncertainties resolved by comparing <https://www.semanticscholar.org
/paper/Distinction-and-Difference:-From-Kana-to-Hiragana-Marks
/f334ea3cb70e933ed4f52e174a41c0242d5204a2/figure/5>.