Here's a simple four-chord progression in standard guitar tuning using the chords G, C, Em, and D. In TAB format, it looks like this:
    
    
```lua
    G Chord:
    e|---3---|
    B|---0---|
    G|---0---|
    D|---0---|
    A|---2---|
    E|---3---|
    
    C Chord:
    e|---0---|
    B|---1---|
    G|---0---|
    D|---2---|
    A|---3---|
    E|---X---|
    
    Em Chord:
    e|---0---|
    B|---0---|
    G|---0---|
    D|---2---|
    A|---2---|
    E|---0---|
    
    D Chord:
    e|---2---|
    B|---3---|
    G|---2---|
    D|---0---|
    A|---X---|
    E|---X---|
```

As for the strumming pattern, you can use a simple pattern such as "down-down-up-up-down-up" for each chord. Here's how it looks:
    
    
```css
    G   -   C   -   Em  -   D   -
    D   D   U   U   D   U   D   D   U   U   D   U   D   D   U   U   D   U
```

"Down" (D) indicates a downward strum and "up" (U) indicates an upward strum. The progression would be played as follows: G (strum pattern) -> C (strum pattern) -> Em (strum pattern) -> D (strum pattern). Repeat this sequence for the desired number of times.

Feel free to adjust the strumming pattern to suit your preferences or the style of the song you're playing. The key is to maintain a consistent rhythm throughout the progression.
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence