a?
	[ ]1	[ ]0 {ssub}
<div id1>
		na [__________]
		mt? [ ] 1 [ ] 0
		<div id=p1>
			p [a|b|c]
			np [___________]
		</div>

		2? [ ] 1 {ssub} [ ] 0
			<div id=d>

			</div>
			<div>
			bp?
			[ ] 1 	[ ] 0 {ssub}
				<div id=be>
					[ ] a {ssub} [ ] ca {ssub}
					<div>
						c:
							[ ] a
							[ ] b
							[ ] c
							[ ] d
							[ ] e
					</div>
					<div>
						dt [____________]
					</div>
				</div>
				<div id='def'>
					d
					dn [_______________]
				</div>
			</div>
</div>
<div id2>
		m:
			[ ] a
			[ ] b
			[ ] c
</div>
[sub]