--------------------------------------------------------------------------

Resolving stem 		A3                 A4               A5		A6

mathematics:		++=		   ++2+		    +=		++=

physics:		++2+		   +++2=	    ++2=	+++ +=

biophysics:		2=		   +++ = =	    +++ 3=	+ = += +

biochemistry:		+=22		   +=20		    +++ 2=++	+ + +

--------------------------------------------------------------------------


Solving stem 		A2		   	A1

mathematics:		c calligraphié ++	o++;+

physique:		+= ++ +=		++= ; + == = == =

biophysique:		+=+			+

biochemistry:		C calligraphié		+=

----------------------------------------------------------------------------

For stem		7b			8b		8c

mathematics:		++ += + +=		= = = =		CCC+=+=

physique:		+=++			=		c calligraphié =+

biophysique:		+=+++ +=		=++		++= +++ =

biochemistry:		+++== == = ==		= = = =		++