L$3=\{0^$i $1^$j where i $<=$ j$\}$ set of $0$s followed by a set of $1$s where a number of $0$s is less or equal to the number of $1$s

A $=\{0,1\}.$

Accepted: $00001111,01111,1111,000000111111111,01,$

Not accepted: $0,001,00011,000001111,00,0000,000000001111$