Please help me with 2.1, 2.4, and 2.7

E2.1 Find the valid and invalid labels in the following statements, and explain why the invalid labels are invalid: column 1 a. ABC b. lp+: c. too: d. not_true e. start- f. decb adda #1 mul nega Idaa #10 too big dec count E2.2 Identify the four fields of the following instructions: b. loop C. here: bne brclr dec not done 0x,$01,loop lp_cnt ; wait until the least significant bit is set ; decrement the variable lp_cnt E2.3 Write a sequence of assembler directives to reserve 10 bytes starting from $1000. E2.4 Write a sequence of assembler directives to build a table of ASCII codes of lowercase let- ters a-z. The table should start from memory location $2000. E2.5 Write a sequence of assembler directives to store the message "Welcome to the robot dem onstration!" starting from the memory location at $2050. E2.6 Write an instruction sequence to add the two 24-bit numbers stored at $1010-$1012 and $1013 $1015 and save the sum at $1100~$1102 E2.7 Write an instruction sequence to subtract the 6-byte number stored at $1000~ $1005 from the 6-byte number stored at $1010 $1015 and save the result at $1020~ $1025. E2.8 Write a sequence of instructions to add the BCD numbers stored at $1000 and $1001 and store the sum at $1003. E2.9 Write an instruction sequence to add the 4-digit BCD numbers stored at $1000-$1001 and $1002 $1003 and store the sum at $1010~1011. E2.10 Write a program to compute the average of an array of N 8-bit numbers and store the result at $1000. The array is stored at memory locations starting from $1010. N is no larger than 255. E2.11 Write a program to multiply two 3-byte numbers that are stored at $1000~$1002 and $1003~ $1005 and save the nroduct at $1010 $1015