1 ~ clk
2 ~ reset
3 ~ dff input
4 ~ q (dff output)
5 ~ not used
6 ~ used for process thar runs only once!


>>>>>>>>>>>>>>>> //make sure this process didn't already run
-
[
    >+< //mark it that it has already run, in 6~3 (6~next)
    <<<<<<<<<<< //position on reset
    [-]+# //reset is 1 and wait for one timetick
    [-]<# //reset is 0 and wait for one timetick
    >>>> //position on 3~3 (3~next, or dff input ~ next)
    [-]+++++ // set it to 5
    # // wait 5 time ticks
    <<<<<< //position on clk
    [-] + # // clk is 1
    [-] < # > // clk is 0
    >>>>>> // position in dff input
    [-]+++++++ // set it to 7
    <<<<<< // position on clk
    [-] + # // clk is 1
    [-] < # > // clk is 0
    >>>>>> // position on dff input
    [-]+++ // set it to 3
    # // wait
    >>[-]+# // current dff output should still be 7
    . // so check it
    [-] // make sure we don't keep looping
]


======
d flipflop:

>>>>[>>>>>>>[-]<<<<<<<[-]] // reset condition
-
[ // not reset?
    <<<
    [ // clock current is nonzero?
        < // position on old clock
        -
        [ // clock old is zero?
            >>>>>>>>>>> // position on output (qnext)
            [-] // initialize output to 0
            <<<< // position on d
            [ // copy d into qnext
                >>>> // position on qnext
                +
                <<<< // position back on d
                -
            ]
        ]
    ]
]