(seq
    (xor
        (seq
            (call "{0}" ("" "") []) ;; initiator that should send data to stream generators
            (par
                (seq
                    (par
                        (par
                            (par
                                (par
                                    (par
                                        (call "{1}" ("" "") [] $stream)
                                        (call "{2}" ("" "") [] $stream))
                                    (call "{1}" ("" "") [] $stream))
                                (call "{3}" ("" "") [] $stream))
                            (call "{3}" ("error" "") [] $stream))
                        (call "{3}" ("" "") [] $stream))
                    (call "{3}" ("error" "") [] $stream))
                (call "{3}" ("error" "") [] $stream)))
        (null))
    (call "{0}" ("" "") []) ;; this one is needed to check check that sliders switched correctly
 )