Q0
        Set up
                : svn export http://unbox.org/wisp/var/timm/10/310/src/prolog/4/a
                : svn add a
                : svn commit -m "4a ready to go"
                :
For each of the following questions, add lines like this to "run"
        printf "\n===== 4/a/q1 ========================\n\n"
        cat myCodeThatAnswersThisQuestion.pl
        execute
                : where "execute" is the "test" command shown below.

Background stuff
   Manual
   		: For a Prolog manual, see http://www.swi-prolog.org/pldoc/refman/
   Beware upper case
   		:When in doubt, make it lower case Only for variables, make them upper case
	File structure
		Same as before. 
			: Files are load alphabetically.
			First thing loaded 
				: "aBagOfTricks.pl"
				: contains tim tricks
			Last thing loaded 
				: "z.pl"
				: contains "main" which, right now, does not much and calls halt.
				: All your homeworks will modify "main" in "z.pl"
	The family database is in two forms: 1) standard; 2) frame
		standard prolog
			: see family.pl which holds gender/2, father/2, mother/2. e.g.
			: gender(anne,female).
			: father(anne,boris).
			: mother(anne,betty).
		querying standard databases
			: parent(X,Y) :- father(X,Y).
			: parent(X,Y) :- mother(X,Y).
			: grandfather(X,Y) :- parent(X,Z),father(Z,Y).
		frame format
			: see frames.pl
			: contains a macro for fast specification of object-attribute-value facts (oav). e.g
			: you write 'anne has [gender=female, father=boris, mother=betty]'
			: prolog turns this into 
			: oav(anne,gender,female)
			: oav(anne,father,boris).
			: oav(anne,mother,betty).
		querying aov triples
			: parental(X,Y) :- father of X = Y.
            : parental(X,Y) :- mother of X = Y.
			: grandfatheral(X,Y) :- parental(X,Z),father of Z = Y.0
		   
Q1
        Write sister/2 using the standard format
        Hints: 
			: a sister is a female sibling
            : sibling(X,Y) :- parent(X,Z), parent(Y,Z).
        Test:
			: modify z.pl. complete the "sibling" code
			: then bash run

Q2
        Write aunt/2 using the standard format
		Hints:
			: an aunt is a sister of your mother (so try to reuse your Q1 answer)
        Test
            : write an "aunts" and an "aunt" predicate in z.pl
			: then bash run

Q3
        Write sisteral/2 using the frame format
        Hints: 
			: see lnes 34.. 37 of frames.pl
        Test:
			: modify z.pl. add "sisterals" and "siteral" 
			: then bash run

Q4
        Write auntal/2 using the frame format
        Test
            : write an "auntals" and an "auntal" predicate in z.pl
			: then bash run
Q5
		Port the scifi story into the format of english.pl
			: everything lower case
			: terminals in square brackets
			: don't forget the full stops "."!!!
			: conjunctions seperated by commas
			: disjunctions are two rules with the same head
			: see "modlist" for how to handel zero or more.
		Test :
			sentence1 :- sentence(X,[]),print(X),nl.
			(do not wrap this in a sentences... it will print out every sentence!)