%%{
  init: {
    'theme': 'base',
    'themeVariables': {
      'primaryColor': '#1A836D',
      'primaryTextColor': '#0D1117',
      'primaryBorderColor': '#1D5116',
      'lineColor': '#1B3E83',
      'secondaryColor': '#093F42',
      'tertiaryColor': '#B0B0B0'
    }
  }
}%%
  flowchart RL;
    M(Math) <--> C(Chess)
    M <---> P(Programming)
    C ---> P
    C & P <---> G(Games)
    B(Books)
    A(Art) <---> B
    A <---> B
    E(Economics) <---> M & G
    B ---> C
    E <--- B
    A & M & G <---> L(Lego)
    L ---> P
    H(Hardware) <---> L & G
    H <---> P
    B --- H
    R(Robotics) <---> P
    H <---> R    
    C ---> N(Neuroscience)
    G ---> N
    E <---> N
    O(Origami) ---> A
    O ---> R
    O ---> M & B & H