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This should work.
```sh
#!/usr/bin/env bash
form=0; stamp=1
[[ $form -eq 0 ]] && stamp=0
while [[ $stamp -eq 0 ]]; do form=$((form+1)); [[ $form -gt 3 ]] && stamp=1; done
[[ $stamp -eq 1 ]] && exit 0 || exit 1
```
```sh
#!/usr/bin/env bash
form=0; stamp=1
[[ $form -eq 0 ]] && stamp=0
while [[ $stamp -eq 0 ]]; do form=$((form+1)); [[ $form -gt 3 ]] && stamp=1; done
[[ $stamp -eq 1 ]] && exit 0 || exit 1
```
This should work.
```sh
#!/usr/bin/env bash
form=0; stamp=1
[[ $form -eq 0 ]] && stamp=0
while [[ $stamp -eq 0 ]]; do form=$((form+1)); [[ $form -gt 3 ]] && stamp=1; done
[[ $stamp -eq 1 ]] && exit 0 || exit 1
```
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