****** semantics ******

2007-11756	9	delay(-10%)
2007-23026	10
2009-20769	9
2009-23151	10
2010-20860	10
2010-20891	10

****** interpreter ****** 

2007-23026	51
2009-20769	51
2009-23151	51
2010-20891	0	fail to compile, delay (10%)

2007-11756	36	delay (10%)
skip.k				OOO
assign.k				OOO
starassign.k			OOO
seq.k				OOO
update.k				OOO
arithmetic.k			OOO
if.k					OOO
loc1.k				OOO
loc2.k				OOO
read1.k				OOO
read2.k				OOO
while1.k				OXe		at label 3
while2.k				OXe		at label 3
while3.k				OXe		at label 3
while4.k				OXi		infinite
no_infinite_loop		OOe		at label 3
all_in_one				OXe		at label 3

2010-20860	50
skip.k				OOO
assign.k				OOO
starassign.k			OOO
seq.k				OOO
update.k				OOO
arithmetic.k			OOO
if.k					OOO
loc1.k				OOO
loc2.k				OOO
read1.k				OOO
read2.k				OOO
while1.k				OOO		
while2.k				OOO	
while3.k				OOO		
while4.k				OOO	
no_infinite_loop		OOe		at all label
all_in_one				OOO