sub zero by zero.slash;
sub zero.tf by zero.tf.slash;
sub zero.circled by zero.slash.circled;
sub zero.squared by zero.slash.squared;
sub zero.sups by zero.sups.slash;
sub zero.subs by zero.subs.slash;
sub zero.numr by zero.numr.slash;
sub zero.dnom by zero.dnom.slash;
