}
		dirOpposite = dir
	}
	// return ON if no strong type found, or class opposite to dirEmbed
	return dirOpposite
}

// classBeforePair determines which strong types are present before a Bracket
// Pair. Return R or L if strong type found, otherwise ON.
func (p *bracketPairer) classBeforePair(loc bracketPair) Class {
	for i := loc.opener - 1; i >= 0; i-- {
		if dir := p.getStrongTypeN0(i); dir != ON {
			return dir
		}
	}