The pipe operator | can be used on to generate a 50/50% choice operation between two tokens. You can also chain them: 1|2|3|4. The behavior of chaining multiple choice operators has not been clearly defined. The distribution might not be the one you expect.

def choosing stuff(p=0.5, i=0):
    D('bd|pluck', speed='1|2', i=i)
    again(choosing_stuff, p=0.5, i=i+1)