I want to know the answer to the following question:
Written Hokkein is based on what?
All the background I'm provided with is that "Furthermore, the character inventory used for Mandarin (standard written Chinese) does not correspond to Hokkien words, and there are a large number of informal characters (替字, thè-jī or thòe-jī; 'substitute characters') which are unique to Hokkien (as is the case with Cantonese).". Is that enough to answer the question?
Answer: no