+ "\x{200B}" => {string => '␣'}, # nbsp: ~ in TeX
+ "\x{200C}" => {string => '|'}, # ISO-9995-7-081 lookalike (alt: ∣ ⊺ ⟙)
+ "\x{200D}" => {string => '⁀'}, # join (alt: ∤ |ͯ ⨝)
+ (map {( $_ => {string => chr(9676).$_.chr(9676)} )} map {chr} # combining double
+ 0x35C .. 0x362, 0x1DCD, 0x1DFC,
+ ),