1♣ -

1♦    =    4♥, 0+, can hold longer m      ➲                      

1♥    =    4♠, 0+, can hold longer m      ➲

1♠    =    7-11 balanced, or 5+♣, 7-13, or 5+♦ GF, can hold 5♦4M     ➲

1NT    =    GF, balanced, or 5+♣, can hold 5♣4M     ➲

⚠️2♣    =    5+♦, weak or invitational, OP must accept the transfer or bid 2M/NT.    ➲            

2♦/M    =    6+ card ♦/M, very weak, natural continuation, penalty doubles

2NT    =    12-13, balanced, no 4 card M

3♣    =    preemptive, 6+♣, OP with 17-19 has to pass

3NT    =    14-16, promising both M ST, if stronger or without both M ST, then over 1NT