[ Ntawv-nyeem ] boolean

Stdout sau-ntawv: [''] boolean, tsum.
Stdout sau-ntawv: [' '] boolean, tsum.
Stdout sau-ntawv: ['abc'] boolean, tsum.
Stdout sau-ntawv: ['123'] boolean, tsum.
Tsis-tseeb
Muaj-tseeb
Muaj-tseeb
Muaj-tseeb