(
  counts: {
    Orange:  500,
    Pink:   500,
    Yellow: 200,
    Blue:   100,
  },
  
  forces: {
    
    (Yellow,Yellow):   0.5,

    (Yellow, Orange): -0.25,
    (Yellow, Pink):   -0.25,
    (Yellow, Blue):    0.15,

    (Blue, Pink):      0.2,
    (Blue, Orange):    0.2,
    (Orange, Yellow):  0.2,
    (Pink, Yellow):    0.2,
    
    (Orange, Orange): -0.1,
    (Pink, Pink):     -0.1,
    (Orange, Pink):   -0.1,
    (Pink, Orange):   -0.1,
    
  },
  
  speed:   1.0,
  damp:    2.5,
  radius: 120.0
)