a { letter-spacing: normal }
b { letter-spacing: 1em  }
b1 { letter-spacing: -1em  }
c { letter-spacing: 50%  }
c1 { letter-spacing: -50%  }
d { letter-spacing: normal 10%  }
e { letter-spacing: normal 10% 10% }
f { letter-spacing: normal 1em }
g { letter-spacing: normal 1em 1px }
h { letter-spacing: normal normal normal }
i { letter-spacing: 1em normal normal }
j { letter-spacing: 10% normal normal }
k { letter-spacing: 0em -1em 1em }
k1 { letter-spacing: 0 -1em 1em }
y { letter-spacing: initial }
z { letter-spacing: inherit }
