But let me encourage you to spend most of your time focused on LANGUAGE with him. Any child with both receptive and expressive language issues PLUS autism PLUS the whole bilingual issue has a lot on his plate so that articulation would be the least of my concerns for him if I were you. My advice would be to focus on what he communicates by improving language FIRST, then worry about speech sounds later. Again – I hope you have a great SLP you’re working with so she/he can help you sort all of this out and prioritize your goals for him! Laura
Deciding how to convert numbers is another problem that TTS systems have to address. It is a simple programming challenge to convert a number into words (at least in English), like "1325" becoming "one thousand three hundred twenty-five." However, numbers occur in many different contexts; "1325" may also be read as "one three two five", "thirteen twenty-five" or "thirteen hundred and twenty five". A TTS system can often infer how to expand a number based on surrounding words, numbers, and punctuation, and sometimes the system provides a way to specify the context if it is ambiguous.  Roman numerals can also be read differently depending on context. For example, "Henry VIII" reads as "Henry the Eighth", while "Chapter VIII" reads as "Chapter Eight".
Interpretations of both the harm and offense limitations to freedom of speech are culturally and politically relative. For instance, in Russia, the harm and offense principles have been used to justify the Russian LGBT propaganda law restricting speech (and action) in relation to LGBT issues. A number of European countries that take pride in freedom of speech nevertheless outlaw speech that might be interpreted as Holocaust denial . These include Austria, Belgium, Czech Republic, France, Germany, Hungary, Israel, Liechtenstein, Lithuania, Luxembourg, Netherlands, Poland, Portugal, Slovakia, and Switzerland.