Different Stimulus Parameter on Every Trial Repetition?

[batshell]

I saw this kind of question asked previously, but mine is quite different.
What I want to do is:

1. Show two colors in a sequence (Red and Blue and Yellow and Green) and then their respective combination. They are to be shown in the exact sequence.
2. Repeat the loop until if user presses 'n' key.
3. On each loop iteration, either of the two combination shall be chosen.

`

var p3_red = {
    type: 'html-keyboard-response',
    stimulus: 'R'
}

var p3_blue = {
    type: 'html-keyboard-response',
    stimulus: 'B'
}

var p3_yellow = {
    type: 'html-keyboard-response',
    stimulus: 'Y'
}

var p3_green = {
    type: 'html-keyboard-response',
    stimulus: 'G'
}

var p3_msg_pair_RY = {
    type: 'html-keyboard-response',
    stimulus: 'Red + Yellow Pair Value'
}

var p3_msg_pair_BG = {
    type: 'html-keyboard-response',
    stimulus: 'Blue + Green Pair Value'
}

`

[batshell]

Nevermind, I figured it out.