/ wooden shovel construction.

Construction		Source		Result
	.	rock floor	0	pit
	~	shallow water	.	dirt
	~	shallow water	.	dirt
		is:DIGGABLE	#	narrow fence posts
	0	shallow pit	#	half-built log wall
	#	half-built log wall	LINE_OXOX	log wall
	0	pit	.	dirt
	0	pit	#	palisade wall
			#	half-built stone wall
	#	half-built stone wall	LINE_OXOX	stone wall
			#	field stone half-wall
	#	field stone half-wall	LINE_OXOX	field stone wall
	0	pit	+	palisade gate
		is:DIGGABLE	#	fence post
		is:DIGGABLE	+	closed wooden gate
	#	half-built stone wall	o	stone wall with embrasure
	#	half-built log wall	o	log wall with embrasure
	0	pit	o	palisade wall with embrasure
	0	coffin	#	grave
			#	fireplace
	0	pit	#	covered well
		is:DIGGABLE
	.	rock floor
	#	solid rock
	~	flowing deep water	|	deep dock pile
	0	shallow pit	T	wind mill
	.	grass	.	dirt
	,	long grass	.	dirt
	'	tall grass	.	dirt
	.	dead grass	.	dirt
	.	golf green	.	dirt
	.	white grass	.	dirt
	.	sand
	.	clay
	#	mound of clay
			U	charcoal kiln
			=	smoking rack
			U	rock forge
	0	pit	=	root cellar
	0	pit	LINE_OXOX	junk metal barrier
		is:DIGGABLE	+	closed wooden split rail gate
		is:DIGGABLE	+	closed wooden privacy gate
		is:DIGGABLE	LINE_OXOX	split rail fence
		is:DIGGABLE	LINE_OXOX	wooden privacy fence
		is:DIGGABLE, FLAT	0	shallow pit
		is:DIGGABLE, FLAT	0	pit
	,	gravel	.	dirt
	.	grass	.	dirt
	,	long grass	.	dirt
	'	tall grass	.	dirt
	.	dead grass	.	dirt
	.	golf green	.	dirt
	.	white grass	.	dirt
	0	shallow pit	LINE_OXOX	stick wall