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+13. VIP Biorhythm
+
+The theory of Biorhythm states that there are thre predominant cycles that can influence
+human behavior.  These include a 23-day physical cycle, a 28-day emotional cycle and a
+33-day intellectual cycle.  All three cycles start at birth and continue throughout life.
+
+Each cycle consists of a positive and a negative period.  Physical, Emotional and
+Intellectual aspects are enhanced during positive periods.  Poor performance is
+indicated by the negative period of a cycle.
+
+A critical day occurs on the crossover from the positive to the negative period or
+vice versa.  A critical day indicates instability in a particular aspect.
+
+
+How to Use VIP Biorhythm
+
+1. Load the CHIP-8 interpreter at 0000-01FF and
+   the game starting at 0200.
+
+2. Turn RUN switch on.
+
+3. Enter birthdate using 2-digit month, 2-digit day, and 4-digit year.
+
+4. Enter start date using 2-digit month, 2-digit day, and 4-digit year. The start date
+   indicates the first day of the 32-day Biorhythm chart the program will generate.
+
+5. After a period of calculation proportional to the span of time involved, the three
+   cycle curves will be shown for a 32-day period.  Each horizontal bit position
+   represents one day in the cycle.  The start day, on the left, and every seventh
+   day are indicated by week markers.  The first day of a positive or negative period
+   is a critical day.
+
+6. To advance the start date, hold key F down until the desired date is reached.
+   To decrement the start date, hold key B down.  These functions allow changing the
+   start date slightly without reentering all the dates and waiting for the calculations
+   to be preformed.
+  
+7. Press Key 0 to clear the screen and enter a new set of dates.
+
+   
+
+   See VIPG1-13.jpg
+
+
+INTERPRETATION
+
+
+			Physical		Emotional		Intellectual
+
+Positive Period		Strong, 		Good moods, 		Good Judgement
+(Up)			Vigorous		Cooperative		Sharp Mentally
+
+Negative Period		Tire easily,		Low Enthusiasm,		Low attentiveness
+(Down)			Less Stamina		Feelings Subdued	and concentration
+
+Critical Days		Susceptible to injury	emotionally unstable,	Poor memory,
+(Crossover)		or Illness,		Upset easily		Prone to mistakes
+			Low endurance