f\bfr\bro\bom\bmt\bto\bo-\b-b\bba\bas\bsi\bic\bc - vertical stacking
D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
- initial text E_(_\bi = 1)^<infinity> 1/(_\bi^2) final text
+ initial text <sum>_(_\bi = 1)^<infinity> 1/(_\bi^2) final text
OpenBSD July 4, 2017 OpenBSD