
sequences of and, or


it's highly recommended that combinations of 'and' and 'or' in boolean expressions be bracketed.


	e.g 	
		if ((a and b) or c)



	not


		if (a and b or c)



this expression does NOT mean

			if (a and (b or c))




sequences of and's or or's are ok



	if ((a and b and c and d) or (d and e and g and k))




check
	compiler option, or text scanning routine


	
		next word on line

		if an 'and', tick 'and'

		if an 'or', tick 'or'


		if both 'and' and 'or' ticked, output the line with a warning message


		if '(' or ')', untick both values






	